Beware, gas grills don't last forever. The self-ignition is usually the first thing to fail (and quickly), but other parts too will wear, corrode, etc. I have nothing against looking for bargains, but you're better off buying used for things that are likely to last a long time. Things that wear out, not so much.
There are always sales on many of the gas grills at the various home improvement stores (Home Depot, Lowe's, Menard's) - probably even more in another couple of months than now - and you can also find a nice assortment at nice prices at Walmart.
HTH (not trying to diss your search...)