Small Shears. These small inexpensive shears with safety tips are so good, I've picked up a pair for general household use, as well as in my IFAK.
Mini bandage packs. Variety packs of bandaids are another good way to go with a group buy, but I've found these little packs to be quite handy, and a fair price for under $2.00. I like that I can put the pack in a pocket in my IFAK, and have all my bandaids in one little water proof bag, plus antiseptic wipes. They're good for keeping in a hiking pack, and glove compartment as well.
Tweezers. I find these better than any standard home health care tweezer, or the plastic sets that seem to come in most commercial camping first aid kits.
Bandanas As recommended by Kim! A good clean bandana can be used to secure a dressing and maintain pressure. They can be cut into long strips and made into slings, or be used to secure a splint. Old sheets pre-cut into strips will also work, but if you also want to be able to make a fashion statement, flash gang colors, or flag for your favorite sexual fetish, you can't go wrong with a good bandana. These can also be found at McLendons, REI, and gas stations, for about 3-4$ ea. as well.
Israeli trauma bandageWound pad, pressure applicator, compression dressing, all in one piece, in a sterile pack.
Mini super glue Another good candidate for group buys and sharing.
Sam's Splint. These fold flat along the back of a backpack, or inside pocket of a saddle bag and offer a variety of splinting applications