I ordered a Zenitar 16mm f/2.8 a couple weeks ago to use with my DSLR. It costs less then $150 (including shipping) to get it here from Russia and I must say I'm very impressed with it. It's even available in K mount to fit my Pentax.
With the 1.5 crop factor of a DSLR it should be about 24mm but it actually is a little wider then that (comparing the framing of a 24mm on my film SLR). One website I read said that because it's a fish eye it's more like a 20mm. Well, whatever, I'm having fun with it. It sure makes self portraits a breeze, maybe this is just what you're looking for Sam.
Here's some quick pics from it. Nothing great, just trying it out.
http://noodledj.com/Web%20Galleries/zenitar%20gallery/index.htmThe second shot is a 100% crop of the 1st. I try not to get too concerned with sharpness but it's much better then I expected. Especially since it was focused up pretty close and handheld with semi-slow shutter speeds. The self portrait wasn't even held out at full arms length.
Definitely one of the best buys out there.

Alan