Hair Vendors (Aliexpress)

Hi ladies! I'm new to BHM. I wanted to try a sew in for the first time and I have a few questions. Some of them may seem redundant or were probably already answered elsewhere, so sorry about that.

Anyways, I want to do a sew in for the first time for my prom in May. I'm 16 and self employed, not making that much money lol so I'm on a low budget for prom expenses. I've heard about Aliexpress and it seems to be in my price range. I'm interested in getting 2 bundles of body wave in 14" and 16" for around $100. Could anyone recommend any vendors? (PM if you prefer that instead). And would 2 bundles be enough for a full head?

Also, my hair texture is very coarse. What blends well? I heard that baby powder gives the hair a more yaki texture, so could that work?

Thanks in advance