Drip Mat?

I use a piece (about 24 in. square) of heavy clear plastic shelf liner that I put under the front wheels of my AQ when I roll it out of the garage to use on the concrete apron, to catch grease spills when loading/unloading the product. After the cook and cleaning up, it needs to be wiped with a paper towel and some sort of cleaner like Simple Green, and then rolled up to sit on the smoker for next time. Pretty cheap and easy and it has lasted all summer so far...

I bought something specifically for this at a local BBQ store.  It is flat, 1/8 inch think and firm material made to go under a grill or smoker.  Wasn't too expensive.  Maybe 20 bucks.