just came across this interesting lens which i cant find any info on but is cheap and wide. although not supper wide on my crop at 16mm
anyone know anything about this possibly great value lens
Amazon.com: Fisheye Zenitar 2.8/16 MC Lens for Canon EOS Camera: Camera & Photo
It has been getting some good reviews.
As someone else said the Sigma 10-20 is a pretty good lens but may be a bit above your price point.