I scored another Exped Synmat UL7 S for 9.83+ tax. Almost brand new, even though it is a 2012 model. No leaks or stains. One word return reason/description: "hole." No holes or leaks present though. I think the owner bought both a medium and a small/short and returned the short in the medium packaging so they could have the medium at a lower price because the stuff sack is for a medium, includes unopened repair kit.
Got my first one a couple months ago at the last garage sale for ~$11 + tax (Seattle flagship did additional 50% off gear in the late afternoon). Again, no holes or leaks (well, tiny one from the valve that I fixed easily).
Also bought this time around: a new X-Lite regular length for 69.83 that was damaged out because the stuff sack was missing. It had never been unrolled. Didn't really want or need it though, but the deal was too good to pass up so passed along the deal at cost in gear swap already.
REI Flash pad Long for 39.83. Not as good a deal as the first one I got last time around (same time/story as my first synmat, ~$12). Still, no leaks or anything.
I've saved a good 450+ dollars on the 5 pads I've kept from the last two garage sales (fifth is the $10 purple Thermarest Women's Prolite).

Come to think of it, including the two BA IACs I picked up at the Seattle flagship continuous garage sale section last year, I've bought 7 sleeping pads for under $100 (excluding tax) combined.