I bought quite a few sets during the >50% clearance sales at Walmart last year, I've bought a bunch of new/open/used sets off CL that I've flipped for profit, I've found recently retired sets in out-of-the-way stores like Ghost & Phantom pairs, and I've bought full used collections off CL. For example, I bought 13 large, used Technic sets off an AFOL in October for $700 and sold them all before Xmas on BL for about $1,200. There's a guy in town that I've bought from a couple times who gets beat up sets from Amazon Warehouse, I believe, that he sells pretty cheap, I bought an open box, sealed bag Tumbler, a beat up, sealed GE, minty Avenger Tower, and minty Quinjet for $400, which I sold the Tumbler for $300 on CL, the GE for $290, the tower for like $50, and still have the Quinjet (surprise). I travel a lot, so when I'm on the road I check Wal Marts and CL where I'm staying. I also found a used Cafe Corner at a garage sale for $80, which helped a lot.