Speaking of First Aid Kit

Does anyone have a GOOD source for various items that go INTO the kit - meaning the disposibles. I need some replacement CPR masks, 4x4s I have, but the local drug stores don't sell kerlix, One local non chain store has the tape I like (3m Micropore) - but cloth tape is probably better for 1st aid, gloves I have (I asked for a few pairs at the nursing home where Dad is). Small individual use antibiotic ointment packs, drugs etc would be good too.

It just seems that the average drug store's "first aid" section isn't all that good. Once you get past 4x4s and rolled gauze and conformal wrap you get into the 'we don't have that' mode