I checked Harbor Freight's website last night & found that their carpet cutter blades are on sale for $1.49 for a package of 2. I ordered 10 packages & the total was about $31.00 including shipping & a little tax. I've been quite happy with their blades in the past, using them in my rotary cutters. Once in a blue moon I'll get one that doesn't cut well, but for the price I don't complain. You can check this out at Harbor Freight.com.
GO OKC THUNDER!