Shnoop via eBay offers the Schick Hydro 3 Refill Razor Blade Cartridge 10-Pack for $8.99 with free shipping. That's the lowest price we could find for the quantity by $6, excluding other eBay vendors. Each cartridge features a hydrating gel reservoir, which releases water-activated aloe-enriched lubrication that forms into a gel as you shave.

Note: These cartridges are new but will arrive in bulk packaging.