Ya know, I bought my blades at Harbor Freight quite a few months ago. However, last week is when I used my first one. And, they work just as well as the Olfa blades and for a lot less money.
The only difference I found was that the little circle that the screw fits into is completely round instead of the type of hole that Olfa has. Fit the same and cuts just as well. For $1, you can't beat that.
~~~An official member of the blade club~~~
Would love to find those blades for my 60mm rotary cutter. Anyone have any ideas?