The cheapest answer by far is a mooring. If you have or can get a mooring permit you are all set. You could also tie the jet ski between the dock and a mooring or the dock and something on shore.
I have used a standard PWC lift and I agree they do not have enough lift to prevent having to adjust it during the season. The lifts that attach to the side of a dock however may have enough lift to keep you out of danger all season.
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