A few things I found in garage sale which I think a good deal.
1. Minolta spotmeter M for $2 works perfectly.
2. Pentax MX with 50mm f/1.4 lens for $5. Everything works except the flash sync. Neither the hot shoe or the pc sync would fire the flash.

The following are not that good of a deal but good deals.
1. Canonet QL17 GIII for $5
2. Olympus 35RC for $3
3. Weston Master II meter for $2
All work fine.