I refill my first aid kits through Chinook Medical. No affiliation.

https://www.chinookmed.com/category/supplies/supplies/1.html

With Chinook's prices, I can completely restock my TRI first aid kits (the $25 kits from Sam's Club) for less than what it cost to buy a new one.

Jeanette Isabelle
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I'm not sure whose twisted idea it was to put hundreds of adolescents in underfunded schools run by people whose dreams were crushed years ago, but I admire the sadism. -- Wednesday Adams, Wednesday