I bought mine used from a guy that decided he wanted the newer swoop style tower on his 02 Mob-V. The bimini was available from 1999-2002 from the factory. Your best bet would be to contact Skiers Choice to see if they still have any in stock.
Talk to your local marine welder, they'll make you one cheap, the expensive part is the sunbrella fabric. I got mine made for under $400. Check the profile pic.