: A long-standing buyer with high ratings from the Better Business Bureau.

A "gray market" exists where individuals buy test strips directly for cash, often advertising through street signs or local marketplaces.

: Buys back major brands and provides prepaid shipping labels. 2. The "Underground" Secondary Market

: Operates a large-scale resale platform for surplus supplies.

The most common buyers are professional services that purchase unused, unexpired boxes to resell at a profit. These companies typically offer instant quotes, free shipping, and payment within 24–48 hours.