I buy it from jhittle online. Here is the link:
http://jhittlesewing.funoverload.com...new_items.html
They send out an ad twice a week. I buy all my rotary cutter blades here because they are $14.90 for 10. The Schmetz sewing machine needles are usually 99 cents for a pack. Fantastic bargains! If the mdse you want is not in the ad, then call them and they'll tell you how to order it. I bought a sewing machine vacuum cleaner for $7.99 from them last week!