Our car came with a window bag. As for a storage rack, there are many inexpensive ways to accomplish this. I have seen a rack made out of plumbing pipe--1&1/2" PVC and multiple fittings(90's,T's,&45's). It was angled back and worked very well for either top. I would guess $10-$15 for this. I used 2 pieces of 1" flat stock(1/8") x 2' long. I bent a 90 so that I had about a 10" vertical leg. The other end of the 90 I lagged to the sill plate(2x6) in the garage wall which is up at about 4'. The wall above is drywalled and either top leans against the wall just fine. Where the top touches the flat stock is heavily foamed and taped. I keep the tops covered with a furniture blanket when they are on the rack. Cost..maybe $10. For winter storage, the soft top goes on this rack and the hard top stays on the car unlatched so as not to compress the rubber gasketing. I'm sure others have devised similar simple solutions
Steve
