Tell me where on earth to but these sheets..? My husband and i sleep on a waterbed be cause the warmness...

My husband and i sleep on a waterbed be cause the warmness from the matress helps near his back backache due to two compression fracture a few years ago.

i am having the hardest time finding waterbed sheets. I know waterbeds are sooo 80's but it help his back so I'll suffer. Some not so 80's sheets would luxury my pain though. anyone know where on earth i could find some?

thanx a bunch