LogFAQs > #972147854

You're fucked on the figure front if it's Square-Enix, because most of their figures will be the Play Arts Kai stuff which is overpriced for the quality.

For figures you want to aim for a few specific brands depending on the type you want.
Ex: Posable, non-posable scales, prize figures (less detailed, but more affordable), nendoroids etc.

Amiami is often a first stop for anything new, but if you don't mind pre-owned there's good stuff. Japanese pre-owned items listed there are in generally good condition, but keep an eye on the grading. Just search for your series and apply filters as necessary.

https://www.amiami.com/eng/search/list/?s_keywords=Persona%205&pagecnt=1&s_cate_tag=1
https://www.amiami.com/eng/search/list/?s_originaltitle_id=19372
https://www.amiami.com/eng/search/list/?s_originaltitle_id=15

For second hand stuff, Mandarake is another known good location

https://order.mandarake.co.jp/order/?lang=en

If you want a US shop TOM may have some stuff
https://otakumode.com/

Can see a decent amount of Persona 5 goodies.
https://otakumode.com/search?category=&keyword=Persona%205

Though for Persona specifically the Atlus Shop has some good options
https://shopatlus.com/