I've run through the car seats which are on offer and these would be my picks. A real shame not to see more rear facing options, but good deals on some boosters. It seems Maxi Cosi have participated heavily in this year's Prime Day which is why I've included so many by them - it's not a sponsored post, and recommending here just means I think it's better than other options on amazon, rather than in general.
⚠️ I just wanted to add a warning first, to AVOID many brands which are on offer, mainly anything with little to no branding, but also specifically: Reebaby/Reecle, Murphy/Miophy, Feakou, Heekin and Lettas. These models are made by a Chinese company called Yangzhou and are sold under various different brandings. ADAC, who sell their data to Which? among others tested a model from this company sold under different brands and it failed drastically. While it is one specific 360 model which failed, personally I would avoid any car seats from these companies and any company who do not have a strong trusted safety reputation. The article warning against them is available in German here; most browsers will auto translate. https://www.adac.de/news/kindersitztest-fruehling-2026-warnung-vor-kindersitz/ ⚠️
These are the seats from trusted brands which are at a good discount:
Infant carriers (Birth - approx 12 months)
Graco Snuglite 2 i-size - £63.99
While there's no base available with this, you can buy it separately for £90 (£100 for a rotating version) elsewhere, or fit with seatbelt. It's a basic seat which I believe is only compatible with certain Graco pushchairs, but does the job. Graco SnugEssentials is also on offer but the Snuglite is newer and slightly higher spec.
Maxi Cosi Pebble 360 i-size - £136.55
Maxi Cosi FamilyFix 360 i-size base - £135.78
Maxi Cosi Pearl 360 i-size - £170.29
For a premium car seat and base, this is a really low price - they are often over £400. If you already have the base or want to future proof, it might also be worth grabbing the compatible toddler seat Pearl 360 i-size, but do bear in mind that the limit on this at 17.5kg is lower than many other 360 degree rotating car seats, (often 19/20kg) so this might not last you to the promised age 4. It can sometimes be better to choose a toddler seat which is not reliant on the "family" base, especially as a lot of them allow much longer rear facing than this seat.
Multi Stage Seats (Birth - approx 4 years+)
Graco Turn2Me Group 0+/1 - £107.24
Very good price on this classic seat modelled on the ever-popular Joie 360 Spin. Rear facing from birth to 18kg, with a multi stage insert allowing good fit at any age in between. The safety results are good and it is a solid choice for the price. Forward facing is possible from 9kg but stick with RF as long as is practical, as it is safer. Does have slightly less leg room and side impact protection than some other 360 type seats, but is compact as a result of this.
Graco Slimfit R129 - £89.99 - Best Bargain
Belt fitted seat which is great for grandparents or as a second car seat. From birth-105cm (approx 4-4.5 years, max 21kg) the seat is used rear facing and from 100cm min it can be used forward facing as a high back booster up to 145cm (approx age 10/11). Good safety results, easy to use and very good price for this seat. Downsides are it can be bulky, the fit for smaller babies isn't great and the belt path is inconvenient for an everyday seat.
Forward facing seats with harness (from 15 months, better 2/3+ years)
Maxi Cosi Titan S Comfort i-size - £119.99
Britax Evolvafix - £144.99
Both solid options to harness up to 105cm and convert to high back booster seat lasting to approx ~10-12 years depending on child and car size, well made and easy to use. The Maxi Cosi harness weight limit is 18kg whereas the Britax harnesses up to 22kg, both are limited to 105cm standing height but have generous shoulder space in the harness. Can be good for children needing to move out of a 360 seat for a younger sibling who are already FF, or children of small stature who are not ready to move to just a high back booster.
Before you buy - there are other longer lasting RF options available, just not on amazon. These seats rely on top tether to fit safely.
Graco Eldura R129 - £52.25
This is an extremely basic seat being belt fitted and offering 5 point harness (forward facing) from minimum 15 months (though better 2/3+ years) up to 105cm/21kg max and then converting to high back booster. In general, I would not recommend this style of seat but there are situations that they are useful. It is a trusted brand and R129 certified, both of which matter at this price point, and it is a good price for this specific model. If you can afford to spend more and don't need FF AND belt fitted, I would go for the Slimfit or the Turn2Me.
Maxi Cosi Nomad XL Plus - £109.81
This is a new style of travel seat which are everywhere at the moment and which do finally seem to offer a reasonable compromise on the combo of portable + affordable + safe. Although a RF option would be better, forward facing with harness secured with isofix + top tether is much better than nothing e.g. for taxi journeys, car sharing, or unexpected lifts, and seems to be cheaper and more compact to produce.There are options from other brands (Kinderkraft, Cosatto, MyBabiie, Bebeconfort) but Maxi Cosi have a trusted reputation and this deal brings their price more in line with the other brands. Note the non-XL version lacks the isofix/TT option, which IMO is what makes them finally a reasonable choice, safety-wise.
Booster seats (from 4-12 years, uses adult seatbelt)
Britax Kidfix Z-Line - £134.99
Maxi Cosi Rodifix M i-size - £74.98
Maxi Cosi Tanza i-size - £63.98
CBX by Cybex Solution B i-fix - £47.69
Selection of high back boosters, listed in order of premium-ness? I think these are all really good prices compared with their normal prices. Z-Line is Britax's amazon exclusive line. Maxi Cosi Tanza folds for travel. The Cybex is an older/more basic model, but well rated.
Bebeconfort Manga i-Fix - £27.98
Backless booster, which can be useful for children who have outgrown a high back booster but still find an adult seatbelt sits too high on their tummy or rubs their neck, or for keeping in the car as a spare for giving lifts. These are normally cheap as chips, but it's rare to see one with isofix (which this has) for under £30.
Happy to answer any follow up questions.