I consider $5 the absolute minimum charge for anything I make, of course most things I make are given as gifts, but if someone asks how much, I'm trying to get better about valuing my time and resources at a price more consistent with current market value.
I discovered a few months ago that a crocheted item I've made several of that I had charged under $10 for was being sold for $29 at a shop nearby.
So you could easily charge $8 - $10 for these and not be out of line. As maine ladybug mentioned, for very good friends you can charge less but be sure they know they're getting a special price and that you would charge more to the general public.