Any recommendations for a good depth finder for my husband's boat in the $120-$150 range?

Both Hummingbird and Garmin make units in the price range you are looking for.

Check out the Garmin Fish Finder 1400, it is good up to about 600 ft of water and has a scrolling view screen. Should be adequate for fresh water fishing (rivers and lakes).

It retails for about $130.00.

You can follow the link below to West Marine's web site. You should also be able to find comperable models at your local sporting goods stores.

Hummingbird depth finders. Local Wal-Mart Sporting goods

most of the brands has a suitable for the price class you mentioned, but from my experience, Hummingbird is quite reliable.

My former one was Eagle, wich stopped working with no sensible reason after 2 years, so I wouldn`t advise to buy that brand.

eagle makes a good reasonsible fish finder that or you can check cabelas or bass pro web site have several to choose from.