How much is it to fix a cracked iPod screen

Depends on where you have it fixed. Here is Apple's pricing. Note that the cost depends on the capacity of the device and that they don't actually repair the iPod, but instead swap it out for a refurbished one.

http://www.apple.com/support/ipod/service/prices/

There are also several third party service centers that offer replacement service at a much lower cost. Google for "iPod screen repair" and you should get a plethora of results to work with.

B-rock