For anyone looking to get a really good sonar, without dropping a bundle, Cabela's has the Lowrance X96 on sale for $119. I have one of these units on my boat and it is awesome, especially for the price. Personal opinion, but I don't think there is a better unit out there for $120. Here's the link...

Lowrance X96 Portable Sonar Unit : Cabela's

Note: The link indicates that this is a "portable" unit, but that is not what the website indicates.