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There's a Sigma AF 24mm 2.8 on Ebay right now for 114 + free shipping... seems to be in very good shape. And the price is very good I think, these usually go for 200+.
No it's not my lens, and in fact, if I had sold some things on Craigslist that I was hoping to sell, I'd buy this... but alas, no money. So if I can't have it, I would rather it go to one of our forum friends...
Sigma for Pentax P Ka 24mm F2 8 Super Wide Angle Lens | eBay