I'm shopping for a Raspberry Pi power supply. They run from dirt cheap (and built that way) to about $15. In the past I have used CUI power supplies for such things. They are reasonably priced (just $1 more than the less efficient Adafruit product), have the usual bullet items (e.g. over-current protection), have level VI efficiency (>=68% at 1.25W; >=73% at 2.50W, and I have had good luck with their products.
CUI 2A Power Supply from DigiKey
If you want one just let me know.