Yes there are a few, a cover shelve by leisure concepts might work for you but it will require about 4 ft of clearance behind your spa or they also make a cover hook that you slide your cover down and into but you will have than to lift it up and on each time.
I enjoyed seeing this posting. I too lost part of my view with my bifold cover on my Hotsprings spa. I was wondering about this post above needing the 4 foot clearance. This can be done. I also thought about a tri-fold cover that would drop down using my existing cover assist.
thanks Arnie