Welcome and congrats on the future tt!!!
As for price, it really seems to vary a little based on area, And of course, condition. Guess the first question is, what is the price for the 267? WHat seems to happen a lot, is a fair amount of new buyers of rv's don't get the as good of a deal as they could. There is a learning curve. Then the extended warranty is added on, and the rv is financed for as long as possible. The result being a 2-5 year old rv is almost as much as what one may be able to buy a brand new rig for with the right deal. When we were shopping, I found some comparable (if no the same model) trailers as our's for only $2-4K less than we got ours for. Brand new, a good price is about 30% off msrp (based on Jayco's website).
I am sure there are many more knowledgable here (and will be along soon) concerning buying used, but I would guess close to 50% off msrp (of current model) would be a decent staring point.
Check all appliances, water pump, faucets, etc... Look for any signs of water damage along all walls, starting at the floor up to the ceiling. Check the roof. All drawers/ cabinet doors/ shelves/ etc... Basicaly everything from the coupler (tongue) to the rear bumper.
Also check the tires!!!! Trailer tires do not age that well due to all the sitting they do. It is suggested to replace trailer tires 3-5yrs.
Not sure what you have for a tv (tow vehicle), but verify you are within all the specs of the truck/ suv. Make sure you get a good wdh (weight distribution hitch) with integrated sway control. Reese Dual Cam, Reese SC, and the Equal-I-Zer 4 way system are all very good for the money. The Dual Cam is a little more finicky setting up than the other 2. The Reese hitch head (both the DC and SC) allow for a little more fine tuning in regards to the wd bar adjustment. And even though the dealer (if buying at a dealer or the previous owner) will set up (or already set up) the wdh, chances are you will need to re-adjust it once you load the trailer uo for a trip. Here is a link to wdh set up
and how a wdh works