Check this roll of IKEA rationell drawer mat
Its' cut into placemat sized pieces and rounded the corners by drawing (and then cutting) round a 5 cent piece
After which time, you'll discover that you have enough mat to make a set of matching coasters. This is also a great idea for those who'd like to recycle mats with different sized cabinets/ drawers.
Now, you know whether this will roll up
Also check out these assorted collection of "coasters for glasses"