Another source would be a supplier or fabricator of plastic products. In the yellow pages this can be found under "Plastics Fabricators," or Plastics-Molders-Structural Foam," or "Plastics-Rods, Tubes, Sheets, Etc, Supply Centers." You could use heavy gauge plastic sheeting or rigid foam panels.
A place like www.northerntool.com has lots and lots of waterproof floor mats in all sorts of styles and sizes (in their "Garage + Workshop Supplies > Floor + Shop Mats" category). They also sell heavy duty tarps; (under the category of "Tarps, Covers, + Shelters).
Summit Racing has similar items at www.genuinehotrod.com under "Garage And Shop Flooring."
Alternately, if you can resurface your garage floor; there are waterproof, non-slip epoxy coatings which can be painted on.
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