Replacing a bathtub - recommended contractors

[Steve Wilmers]

I recently noticed a hairline crack on the floor of the almond colored bathtub in the house I'm currently living in, which I will be converting to a rental in the next three to six months.

I've already put in a new floor and vanity in this bathroom, but was holding off on replacing the bathtub due to the estimated costs I've heard from others.  

Has anyone recently had a bathtub replaced?  If so, what did it cost? (including labor and material).  What was the bathtub made of?

Also, a follow up for investors in the Grand Rapids area, who do you use as a contractor for minor rehabbing projects such as this?