Pack of 2 Carpet Cutter Replacement Blades
Item # 97642
They seem to be scarce to non-existent at the Harbor Freight in Houston. :)
I bought several packs a few months ago but haven't seen any in the store lately.
I read on retailmenot that HF is running a free shipping special March 14-20.
The $1.79 special might be over by then but the overall savings is still well worth it!
...might be something to look into!