Where do I get the oversize spools of thread?

[bayberrybush.livejournal.com]

Hi, you incredibly resourceful people. I am having trouble finding the huge spools of thread - the ones that are about 6" tall and have lots more thread than a standard spool (intended for commercial use). None of my local stores carry thread in the quantity I need.

Does anybody have an online source for these huge spools?

Thanks!