Everyone may want to check for medical supply stores in their city. There are a few around that carry better products and accessories, like Biersdorf stuff, and individual doses of meds as well as triple antibiotic packets.
I carry a small "kit" in one of those advertising bandaid dispensors that insurance companies give out when it's time for benefit fairs at employers. Have a few bandaids, some Steristrips, #10 and #11 scalpel blades, and triple anitbiotic packets. Only about 1/2" thick (or less), 1.25 wide, and 4.25 long. Very handy.
Also scour the Walmarts, and any drug stores for bargains on content items. If you have family or friends who are interested enough to carry stuff like this, you can easily breakdown into multiple kits, spreading the costs.
You can also make small on-person kits, a bigger car kit, a house kit, and a BOB kit.