18,900 does seem high! 98K on the clock is a good find though! Especially for being 8 years old!
Go to
New Car Prices, Used Car Pricing, Car Reviews by Edmunds Car Buying Guide and pull up their used car value and see what it says. 9 times out of 10 it is lower then KBB and NADA and you can use that as a good reference when haggling with the finance guy!