I'm looking for a 2' x 6' rubber anti-fatgue mat to place in front of my work bench. Standing on concrete even in shoes or boots with good support tends to make my feet, legs and lower back sore after a couple hours. I know part of the problem is getting older but thats not anything I can control. I'd like to have something pretty durable to metal chips, sharp edges and solvents used for general cleaning, etc. Some of these mats can get a bit pricey. Anyone have a good source for purchasing retail?