You really need to shop around on line and off.Under $200 will not get you much more than a grey scale unit.Keep in mind that you will not see much at 4 ft of water.I recommend you bite the bullet for a small portable 300 series hummingbird with built in GPS.You can enter way points,and follow your trak back if you get lost in a waterway swamp.The fishing buddy is ok also if it is the model with side scan.I really like that feature.Do some homework on the models,then check ebay,CME marine,and the hummingbird on line site.Beware of Walmart.They sell obsolete and discontinued item.Good luck.Rick