Look up in Longmont. We bought our current rig at Windish, off of 119 and I-25, on the east side frontage road. There's a few other dealers there too. We bought new, but Windish had what looked like a decent selection of used toyhaulers, our old bumper pull included because we traded it in, but it did seem to sell quickly. They also have a location in western Lakewood but that's much smaller and didn't have the selection the Longmont location had. Perhaps you could even talk to them and have them call you when they get something in that fits your criteria if they don't have what you want right now. We worked with Marty as our salesperson and he was very nice to work with, knowledgeable too.
ETA: If they still make that XLR you're interested in, you could always look at a new one just to get an idea if you'll like it or not before you start a goose chase to find a used one.
