I've seen the EZ Dump inserts advertised for as low as $1895 installed.
But I have a question, is the Dodge 150 you mentioned a half ton (an older model of a 1500 series?)?. If so, I don't think the EZ Dump is for you. I think it weighs like 700 lbs alone. Add 1700lbs of debris and you're gonna break your truck!
Considered a heavier duty truck? If you do go for a heavier duty truck, some of the dump options are:
Little Tipster inserts
LoadHog (it's an airbag that raises your stock bed to dump)
and probably a couple others I've forgotten.