a new 26 is $299, but has better features (bigger grate, very high quality grate, grate sits closer to rim, bigger vent holes, enclosed ash catcher)
If those features aren't important, and you don't want to spend 300, the 150 deal is good
26" grills are hard to come by. There are people that have been trying to find one for years.
With you being in the midwest, your odds are better than most everyone here.
I wouldn't pay 150 unless it were newer or colored, but the price isn't out of line.