I want to use .biz for a online shop website.One of my partners is dropping about 150+ .biz domains. Good ones too(if they were .com), but they never got any traffic, no offers, and never sold one. In fact, i bet they will be hard to give away!
It was a learning lesson for my partner, and a waste of good money that could have been .com's
None the less, here is a site you might like: www.domparison.com www.Namesilo.com or google 'compare domain prices'