I have a set like the ones Gavin links to that are for sale in "Swap & Sell" right now for $40.00 shipped in the lower 48. It should still be in the middle of the 1st page.
I had a bottle of detergent spill in mine last year and hosed it out. Then I was two weeks with the floor mat partly pulled up and wiping it with bleach to kill the mildew.