I just bought 10 blades of the 45mm on ebay for 13.00. She also sells 25, 50 and 100 count packs and the more you buy the more you save. I think they must be a generic brand but they fit my olfa and work just fine. I have also bought resharpened blades on ebay and they work good but do have a greasy feel. You can buy your own blade sharpener too.