Sure thing.
Free:
Google analytics -
http://www.google.com/analytics/
Med Price:
Hitslink -
http://hitslink.com/
Med - Very High Price:
Omniture -
http://www.omniture.com/
Clicktracks -
http://www.clicktracks.com/
Websidestory -
http://www.websidestory.com/
There are a ton of others as well. Do a search for website analytics, and find a company that offers conversion tracking.