Sounds about right but hard to say. Has it been stored inside? 10 years old so the canvas could be rotten. Are they asking 2000 if so offer less. I would check all rv sell sites on the net to see what others are selling for. Might even ck ebay.
You can go to: http://www.nadaguides.com/ and look it up yourself. The Taos is the smallest pop-up Coleman made. I doubt 2K is too far off, but I have not looked it up. At the web site, add an AC if it has one. Don't add anything else as an option.
I just went there. $1,675.00 with AC and $1,410.00 without, but with something 10 years old, condition effects the price sometimes more than book value. If it is in REAL good condition, I might be asking that also, but willing to take an offer.
You should look to see if there is an option I am overlooking. ONE thing, do not add an option that is standard equipment. A lot of people do just that.
NADA seems to be a good place to find out 'buying price'. The online version lists 'average retail' and 'low retail'. If you are buying from a dealer, shoot for low retail or below. If you are buying from a private party it is helpful to know the 'wholesale price' which is what a dealer will allegedly pay. From a private party, you should expect to pay between wholesale and less than low retail.