@jocelinne
Off the top of my head mixed calendars around the £100 mark or below
M&S
Glossybox
You (Beauty or similar can't remember the exact name but they also do a beauty box subscription so can google)
OK Beauty (there was a £25 I think off voucher code around)
Naturismo
Holland & Barrat
Look Fantastic
Mixed ACs usually have some makeup of some sort, or stuff you wouldn't necessarily want. You just need to find one with a higher number of skincare and haircare and just ignore the rest.
I'll add more if I find my scribbled notes on a piece of paper I missled. Possibly thrown away!
I didn't see any hair specific ACs for £100 or under but they may well exist on brands' own websites
12 days ACs are a bit cheaper
Skincare own brand at the lower spend Nuxe and Avant, Clarins 12 days
My memory might be a bit wrong but the above is more or less correct.