I have a Mendota Seabrook D-40 insert I'm looking to sell, and was offered $1500 on it. Price new was $3200 for insert + surround, plus $300'ish for the flue adaptor/liner kit, purchased in 2003. $1500 seems low on a barely-used $3500 rig only 9 years old, but maybe it's fair? What do you say? Never bought/sold any used hearth equipment, so I don't have a clue. Thanks!