I will only buy these in person... I roll them out and check to see if they are straight before I buy them, and do not prewash them either LOL
If you already have them, you can try stretching the fabric on the bias to straighten them out. This is old school technique that we were taught in Home Ec :wink:
If the pieces are fairly small, I would cut them so they look straight. If you are talking large squares or borders, I would probably cut them on the straight of grain. :D:D:D