I dont know if there is a place by you but that's what I do (among other things) in AZ. If it is a hard fiberglass shell top, we charge 695 to R&R a top. Its not the easiest job to do, and if it was done right when you pull it off you will need quite the bit of body work to make it presentable while there is no "top" on your car.
If its just the 1/4" closed cell foam, with material glued to that, then that stuff is fairly inexpensive and you could probably get some vinyl from an upholstery store and have a seam sewn between two pieces to make it wide enough to stretch over the car.
on my 68 SDV the material was glued to the foam, and then tucked into the window channels, so I don't know how yours is, a picture would probably help a bunch there...