I shipped a boat
a little less than a year ago and used Uship - they quoted me but I went with Thomas Duncan - tduncan55. WeMoveBoats - not sure if that is what you mean by the vendor- was about 20% more than most of the bids I received.
If you get a quote from Thomas I would highly recommend. At the time he was listed as the 2nd highest rated sailboat shipper on uShip.