my friend showed me this binder few weeks ago and my mom ended up buying it as i told her it was just a sports bra, there are a lot of reviews from trans people so if thats an issue tell them you either didnt read them or just insist that you're cis lmao. it doesnt bind as flat as gc2b but it gets the job done! heres the link!
its currently out of stock but i can confirm it works actually quite well! hope this helps someone!!