I get the carpet blades at Harbor Freight (thanks to somebody telling me about this a few years ago) and haven't had a single problem with them. I get them when they go on sale for $.99 and there are two in the pack. If I do get a bad one in the future I will not mind because I've had so many good ones so far. It is worth it to me to change the blade every few quilts because I can use the blade for paper projects.

