Fresh or salt water? Why 110? I don't know how long they would last for saltwater, but you could buy several Sears shallow well pumps for the price of Groco marine pump. The pump end of the Sears is pretty much non metallic or stainless. If you want to stay with marine grade, you may want to call Depco in Clearwater and see what they recommend.
Me, I have a 24v Sureflo Extreme Blaster raw water pump that has worked great for 2+ years and has got a LOT of use. .