The plate BM-613, find it here, has a few different face designs to chose from. I've ordered plates like this before but they were so big that when I placed it on my nail you couldn't tell it was supposed to be a face. This plate is the perfect size.
Sally Hansen has an affordable polish line Insta-Dri, that works great for stamping, is cheaper than stamping polish, and you can find it just about any drugstore. I used Silver Sweep here.