Not sure what type of first aid you are looking for, but there are a few options here:

http://www.cheaperthandirt.com/ItemListing.aspx?catid=277

Make your own first aid kit:

When I go 'up north', small accidents usually mean somebody got bit by the bowsaw or they got a burn. A 'bowsaw firstaid kit' IMHO would be a bottle of betadine and a roll of medial tape. Burns are a little more complex ... lots of gauze, guaze paddings, large quantity of some sort of burn ointment, and a roll of medical tape. Throw in a VERY sharp thin-bladed knife (for cutting tape, poking slivers, cutting off loose skin), a good tweezer, a box of bandaids, a wire-cutter (method of removing fish hooks) and I'd say you have what you need.

Review:

- bottle of betadine or hydrogen peroxide
- roll or two of medical tape
- large tube of burn ointment
- gauze pads
- roll of gauze
- sharp thin-bladed knife
- tweezer
- box of bandaids
- wire cutter
- bottle of (real) aspirin
- bottle of other head-ache medicine
- bottle of decongentant / cold relief

Won't be as pretty as those nice kits in the store, but you will actually have exactly what you need.