I don't have a link for you but yes there are generic dust covers for electronic gear. Some of the office supply sites sell them.
If you don't mind people thinking you are some kind of freak, NicksPicks makes some unreal tiedyes. You could have him make you a piece that could be draped over your deck or sown to fit. You can also just drape a pillow case over the deck.
This reminds me, I gave away my all of cassettes and I have a DR3 I should sell.