Query to the Peanut Gallery

Do any of you kind people who read my LJ *and* live nearby happen to have some foam sheeting I can use for insulation at work? The wall directly next to my desk radiates, nay, has a constant river, of cold air flowing onto me while I work. The sheet would have to be at least 3' x 3' I think to be effective.

If need be, I'll go find some at JoAnn's or the like, but thought I'd check the Network first :)