I've found a few cutlery items in antique shops that I got good deals on:
-A 1970's vintage Western Hunter fixed blade in good condition. The blade was still shaving sharp, and there wasn't even a patina on the blade yet. There is now, though.

Got it for $45.00
-A Gerber Parabellum folder with 440c steel and original two way carry sheath. It was still in mint condition. Original edge, sheath looked like it had never been used or carried. Not even a single scratch on the blade.

Since I'd wanted a version one Parabellum for over a year, I couldn't pass it up. Got it for $30.00
-A WWI or WWII era Ontario Cutlery U.S. Army kitchen knife with 9.75" carbon steel blade. It somewhat resembled their Old Hickory line of kitchen knives, but it was beefier. Was slightly patinaed, but the edge needed a little work. Got it for $6.00.
-Some kind of rapier with a 30" carbon steel blade. It was marked "ceremonial sword," and I only paid $30.00 for it, but the blade had the right amount of flex for a European rapier, and it sharpened up easily enough. I'm not sure if it would be considered quality by the guys over at SFI, but it certainly is much better quality than the junky SLO's (sword like objects) sold at flea markets and in mall boutiques. It's fun to cut bottles and pool noodles with.
-A Keen Kutter roofing hatchet of some kind. Had a friend of mine put the edge to a belt sander, and now it chops great. It resembles a tomahawk more than a hatchet, though. Handles like one, too. Got it for $30.00.