http://www.nikonchat.com/nikon-d90-prices/

I am looking for a wide angle lens to fit a Nikon D90. Help?
I have a Nikon D90 and I'm going on a trip to California and I'm bringing along. Would reach an accessory wide angle lens to make my photos more interesting, I was looking on ebay and now I can not find an attachment that I believe would be fair for my camera. Does anyone know a good brand? I am looking for a good brand with the lowest price possible, but I'm willing to pay a little more for a good grip.
If you want one for the mere fact interestingness then just use the fisheye setting on your camera, but if you want to leave $ 429 in BH can get the Sigma 10-20mm super wide angle zoom. 10mm is as wide as you can get before having to go fish-eye and if your shooting landscapes or interiors of buildings I really do not distort. This man shoots almost every one of his photos in 10mm and if this does not convince you not to buy an attachment nothing will. http://www.flickr.com/photos/erikchristiansen/
Nikon D90, Quark RGB, O-like 200mW red laser pointer burning a worm