I got a set of these from purpleman and love them. Someday I will actually use them!
I only got 50 as anything under a yard will go in a plastic milk crate like she does secured with a pony tail holder.
If I have more than 50 pieces of fabric more than a yard that's too much and I better get sewing.
I also picked up some of the big vinyl coated paper clips to use instead of pins. I didn't check walmart but got them at a CVS drug store.
I don't expect to have any rust or corrosion problems with these.
:-D