Originally Posted by
HouseDragon
The Olfa blade fits all of my rotary cutters. I bought a bunch of cheap pinking blades a couple of years ago (from??? possibly harbour freight???) and they also fit all my cutters.
1) They work best on a non-healing mat. Get a cheap mat at a big box store!
2) Get a heavy metal carpenters rule to cut along: it won't hurt the blade and you'll avoid nicking your good rulers.
3) Well worth the trouble: you can pink the edges of a pile of fabrics in nothing flat. I prewash ALL my fabric and the pinked edges don't fray. 
Where do they keep them? I've checked my HF and they don't carry any blades at all.