I mentioned 'Good Deal Karma' in Recent De Acquisitions thread after selling my DA*16-50 for $270 shipped. Giving a good, square deal often seems to land one in your lap soon after.
For several months, I've been hunting for a 1957-1958 Takumar 58mm f/2.4 in good condition. I want to use it, and display it with one of my two AP bodies. The Takumar 58/2.4 generally lists on eBay for between $150 for a fungus riddled turd from Japan, to over $300 for a near perfect example.
Functional Asahi Pentax bodies are $225 (ugly) to nearly $500 (mint). An auction popped up during a broad 'Asahi Pentax 35mm camera' search. "Original 1957 Asahi Pentax with Takumar 58mm f2.4, case, Strap Caps." Starting bid $195. I took a shot with a $267.99 max bid. Shipping is $15. Only one other bidder hit it, a professional sniper tried $199.00 with five seconds left in the auction. I got it for $200, $15 shipping and the 6% PA sales tax! I'd say that was a good 'karma' trade of a lens for a lens and camera!