With the Strolli the only place one you'll get one is now eBay as they've discontinued them so no-one appears to stock them anymore, mine was £55 brand new & they're going for stupid prices on eBay some as much as £90 So might be worth looking locally in things like the local paper or on PreLoved if you did decide you wanted to get one.
It's tricky to know what to suggest without knowing what kind of thing you want as there are many out there.
You could go down the traditional pramette route (this lays flat in a carrycot mode when baby is newborn up to 6 months & then faces forward when baby is able to sit up) So something like this
You could also look at more modern pramettes, this is again where the carrycot & seat unit are all in one but with the modern version once baby has outgrown the carrycot the seat unit is both rear & forward facing. So something like this (you would also find it very easy to attach a Strolli to this one)
If you're not fussed about a carrycot you could opt for a standard stroller/pram that just lays flat making it suitable from birth, so anything like this or this.
Another worth looking at would be the Mamas & Papas Luna or Luna Mix. With this you can either use flat from birth or add a soft carrycot so that baby faces you for a while. Luna's are really lovely & I've just bought another for DS (had 2 for DD at different ages as sold & regretted it). If you opt for the Luna I would say to go for the Mix as this is a 3 wheeler & personally I've always found it's easier to manovre & get up curbs when a holding a childs hand with a 3 wheeler.
Other ones to look at would be things like the Loola (this is a marmite pram so worth trying out first as you may hate it, I loathed mine), the Quinny Buzz, Mothercare MyChoice, M&P Skate, M&P switch - there's lots of others between too!
A shop on eBay worth watching is this0 they are Dorel who are stockists of things like Loola, Quinny, Mura & they list returns etc on eBay. Everything is always listed as used but 9/10 it will arrive brand new, if there's ever a problem they sort it out double quick. I have bought 4 or 5 from them & so far every pram bar one arrived brand new, one had a small problem but they sent me out some new covers immediately. It's worth looking if they sell something you like as you'll get it for a fraction of the price!
If I can be any more help just yell