I got a good deal on used mats on craigslist, but it took some persistence. I use craigslist a lot, and here's some things I've found helpful:
- Use a craigslist tool that shows pictures with the search results, e.g., a Firefox plugin (e.g., craigslist fusion), or smartphone app (e.g., cMobile)
- Be creative about search terms, and include misspellings, e.g., martial, wrestling, gymnastics, exercise, cheer leading, mats, matts
- I only buy things at a very good price on craigslist. This is essential in the long run, to make-up for the occasional bad purchases, e.g., things that prove to not work well or not last long
- I often have to drive an hour when buying uncommon things (e.g., mats). I try to get a lot of info over the phone first, to avoid wasted trips. Some people exaggerate how good of condition things are in, but most don't.
- Find good sellers--people you can trust. Most sellers are like that in my experience.
- I usually stay away from "too good to be true" sales, and esp. from shady people. I don't want to buy stolen stuff, nor transact with thieves.
The mats I got were from a dojo that held a huge weekend tournament, and afterwards, they had hundreds of puzzle mats to get rid of. I got a good price ($15 each for 3x3 ft mats), and they were barely used.
Wrestling mats are very heavy and thus hard to transport (need truck or van) and move around in your house. Puzzle mats are better in those regards, but you may need to get two layers, to get enough cushion.
BTW: A friend is a wrestling coach, and he strongly discourages people from getting home mats. The main reason is that, in his experience, most people don't use them much, once they get them.