Quoted from Bob86ZZ4:Buddy of mine runs a small used car dealership in Minnesota. He's got a '05 Chevy G-1500 cargo van, with the 4.3 v6 motor, 206k miles, lots of e-track installed, barrier to the front seats, and a lift inside the back doors. This would be a great pin transporter. It was a company truck, well maintained. He's asking $2995.
I've put 100k on one of those and that's a pretty fair price if it's running well. I didn't get that high in mileage but never had much trouble with it... heater blower died around 160k and rear differential went full shrapnel about a year prior to that but wasn't expensive to fix. 15mpg, give or take IIRC.