There are some "okay" flashlights for under $5 that use AA or AAA instead of button cells. They are all made by Dorcy:

• Anglehead 41-4235 28 lumens, 3xAAA
• Flashlight 41-2461 25 lumens, 2xAA
• Keychain 46-4001 10 lumens 1xAAA. This could probably be added to your list since it is keychain sized ^_^