[Rich]

If your covering is in good shape, perhaps take it to someone that specializes in repairs and have them restuff with new foam, or a foam that won't hold water.

Perhaps someone like Ship-Shape marine. They can take out the old foam, install new and restitch the seams.

This should be a lot less expensive than having a new cushion made as there is not a lot of labor involved.

If you try to wait for your current foam to dry out itself, you will probably end up with mold stained covers, then the replacement will be a lot more expensive in the long run.

Good luck, let us know what you end up doing and how it works out in the long run.