I've only bought Fauxton keychain lights from DX. They make great give away lights. I'd ask around on CPF what the better models are.

Personally, I think the Fenix E01 is the perfect loaner light. Single mode, AAA battery, 10hr+ regulated runtime, extremely durable. Put in a lithium AAA and it'll run forever. Amazon has 'em for around $12.

No affiliation with Fenix, I've just given out a bunch of them as gifts to non-gadget people.