One way to cut down on first aid supply costs is to go to the local farm store. Ours has a medical section for treating horses and cows/pigs etc. Some of the stuff is exactly the same stuff you find for humans, just cheaper. Mostly look for sterile gauze and those elastic stick-to-themself bandages. They also have 99% rubbing alcohol for the stove freaks. I haven't found any use for the drugs, other than aspirin for the dog (they sell dog specific aspirin).