When it comes to matting, it is a science in itself. Framers make a pretty penny for their trade because it's a technical, nuanced, pain in the ass that makes your photos, prints, and images look beautiful beyond belief. Seriously, a print is just a print until it's been matted.
When you are ready to mat your work there are several places to purchase matting from. Any fine art supplier will offer good 4 ply matting in various colors and sizes that should fit your needs. Your average art/craft stores will carry 5x7, 8x10, 11x14, 16x20, and even larger sizes at any given time, if you want something custom you're either going to pay more for custom cuts or learn to do it yourself with a mat cutter. Finding matting in a brick and mortar shop is not a hard task, but finding matting online...not fun and not advised. Let me tell you why.
I'm writing this quick post as a bit of a public service announcement regarding buying matting and mat boards online, especially through Amazon and the like. Amazon is magical and we all love it, but when it comes to paper goods like matting and mat boards my advice is to skip it. Skip it, force yourself into your car and just get matting in person at an art supplier. Why? Two reasons: Shipping and Quality.
Shipping: It doesn't really matter what a seller says, your mats will almost always be shipped in cheap plastic wrap and show up with dinged corners and curling. I have never had any online orders for matting show up in good condition, they were always raised, curled, or dinged up. I'm a perfectionist, I can't use curled crappy matting for my work, that's not what I want and that's not what my patrons deserve. Wasting your time and money and getting hulk-mad because of a bad purchase is not ideal. For paper items like these just get them in person. Too much manhandling occurs during shipping to ensure a perfect mat, trust me.
Quality: It is amazing how inferior the quality is of some of the matting sold online. I've ordered mats that literally ripped in half while handling them, others that flaked off and peeled right out of their wrapping. Amazon is a mixed bag with their sellers, but from what I've seen (and many reviews will tell) the quality of their matting is sub-par. Once again, just leave your house and buy matting in person at an art supplier, you will at least be able to feel and examine the matting there without gambling on online matting.
So there it is! If you are shopping for mats for your images just skip the online process. It's risky and often ends up in an aggravating waste of time and money. Jerry's Artarama has a great selection of matting, plus 5 and 10 packs of several sizes which will come in handy. Stores like Michaels and the like are okay, their selection is basic and limited, but sufficient. Wherever you like, just go there and pick up the matting that you personally picked out and examined.
The takeaway is that you get what you pay for. Amazon may have a pack of ten 11x14 mats for $10, but you will receive bent, dinged, curled garbage that you'll end up throwing in the trash. Go to an art shop and spend $4 per mat for a high quality, flat, acid-free mat in perfect shape. When it comes to art supplies and finishes don't nickel and dime, spend the extra dollar or two and get the right product. Your art will appreciate it, your eyes will appreciate it, and your buyers will too. Quality always shows through.