About a year an a half ago, we bought a 3-tiered mat merchandiser display through Gemini Moulding (or the acrylics end of their line, the name which eludes me now). It stands about 4' tall and is on wheels so can be moved if need be. What was great about the product was that they will customize the size for you. I think the standard size is about 40" wide, but I had a size limit, so they made the width 26" by my request. Even with the shorter width, I am still able to display 3 brands of mats, Artique, Crescent and Bainbridge. As far as sorting, I went through all three brands of mats, found the ones that were virtually identical to each other, removed the dupes, and wrote the deletions on the back of the mat I kept. Once that was done, they were all devided by color, stacked, then color coded with a one inch stripe of the appropriate color done with acrylic paint. Has worked very well for us. The paint works better than say a marker, because if you decide that the mat you marked as blue really should have been marked as green, you can sand off the paint and remark a lot easier. To divide the colors, I picked up three sets of plastic dividers from Larson Juhl. Very durable and attractive. They come pre-marked with color separations, but they didn't work for my purposes, so I relabled them using one of those lable machines. So far, working great!