The boat place on 290 is under new management, there is a Korean owner now Mr Sung I think. He seems to be fair and will claim zero knowlege of boats if you ask him.
I too sold my boat there about 2 years back and things went smoothly under the previous owner. My neighbor just bought a 22 CC Century from there and is now selliing his 18 Kenner
Just a FYI if you need an mechanical work it would be best to take it elsewhere, they seem to be swamped with work and Im not certian on how well of a job they do.
There is also Neal's Boat Service on Huffmeister about 3 miles north of 290 which allows consignmnt boats.
Besides that you can try boat trader, park it on the side of the road with a sign, or try any of the many consignment lots in and around Tomball.