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The problem is exactly as you describe it.
In removing the old boots, you rip them off. They can't be reused, because of the removal. As a result, used boots don't exist. New boots do exist, they are expensive. There are methods used to refurbish, repair boots, that allow you to continue to use them. There also comes a time when that no longer works.
There are weeping wing (TKS) de-ice systems used by other planes, and electric de-ice used by someone, but neither is availble for the skymaster. It would, in the United States, require an STC, which is an expensive process.
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