As of this evening, Aug. 16, they are still on sale for $1.49 for a pack of 2 plus shipping on their website, which is pretty reasonable. I have had good blades from them myself. Sure beats paying $5 or so per blade. And they fit my Martelli, Olfa & any other 45mm cutter I have. I definitely recommend them.
You may have a problem finding them at Harbor Freight stores because quilters buy them as quickly as they become available. Or so I have been told.