Feather Hi-Stainless Platimum Double Edge Razor Blades 100 Ct: Health & Personal Care for $36.02 + free shipping
I had posted a previous deal for 50 of these for $19.94, from the same merchant. That price has since gone way up and I expired it, after it was brought to my attention.
$36.02 for 100 of these works out to $18.01 per 50 blades. A big purchase if you don't know how the Feathers will work for you, but a great deal if you already know!