I've had a 12x18 mat I've used for paper cutting - so possibly I could lay this one and my first one together.... but maybe it's the width I need more? Without having done this at all, it's hard to fully understand why you need what. Hopefully someday I'll be answering posts like this! ;)[i]
And I'll check JoAnn's for the Connecting Threads brand.
Thanks for all your comments!!