I'm talking (hah!) about full cast audio stories though, so 192 is really the minimum. I did have them all as m4b (the official itunes audiobook format)but sadly rockbox doesn't support it, so had to do a batch convert (ouch).
So moral of the story there is to buy a couple now for storage!
Full cast????? With music?
Buying a few Clip+ players might be a good idea, however don't buy too many, as the battery capacity will decrease over time even if they are not used.
I guess some might suggest sealing them well in plastic bags to keep out the moisture, then putting them in the refrigerator.
Don't freeze them, as that might destroy the battery. Make sure the part of the refrigerator you put them will not freeze.
I don't have my spare players in the fridge. They are at room temperature. I only have a small number of spares.