Undecided Question

Which skin care products can I use containing Alpha Hydroxy Acid?

I have a tiny bit of acne on my cheeks. It's not too bad, but my doctor said that I should try a product containing Alpha Hydroxy Acid. Does anyone know of any products that I could try, and where to buy them? Also it would be nice if they weren't over $30, but if they are it's okay. Thanks!