With the recent Smith & Wesson factory rebates, new Shields were just over $200. I'd expect a used gun to be priced less than new, so I don't think $150 was too far out of line.
Years ago I bought a Tanfoglio Witness .45 for $285, and it was a very good gun. Had to sell it when I needed money bad, and got $215 back. Somebody got a good deal on that one, but I comfort myself by figuring $70 to rent it for 6 years wasn't too bad.
Just cruising Gun Broker, once you get past the Hi-Points, it looks like SCCY offers several auto pistols (new) in the $150 range. I have heard good things about those, but anyone here have any experience with 'em?