Great Lakes is and was the original supplier for your bimini top. They do supply the frame as well as the canvas. Suggest calling them direct to get the pricing. I just got a quote for a biminin to mount on my Extreme wakeboard tower (original supplier to Sea Ray). GL's customer service was...
I too would suggest you contact Monster Tower. My marina sheared off two of the bolts used to attach my wakeboard racks to the tower. Extreme shipped me 4 new ones same day - cost only $1 including shipping!
Any word on if Gary stayed on with Park? He's done several repairs for me as well, treated me fairly, and I was pleased with his work. Fair pricing. I too hate to see this happen, will not be surprised if labor rates do in fact go up.