Only as a DIY project, I'm afraid. The best one I saw had a small aluminum flange which screwed into the metal behind each zipper. This was very thin, so as not to push the two halves of the cover apart, and there were four total: one on each end of the cover's two halves. These stuck out just far enough for a rope to attach with a thimble, and each half of the cover had two ropes so it would pick it up evenly at the center.
Then they had two more ropes: one to each handle on the two ends of the cover. THAT is the part I thought was not very elegant, but it worked great: all the ropes were lead off to a common hand winch (from a sailboat supply house). They ran the ropes through PVC conduit in gray - which happened to be the common color of the cover, the spa siding and the gazebo so it worked.
HTH