Jimbo,

Here's a cheap DIY cover idea that anyone can make.
It uses Duck Tape, how can you go wrong with that?  ;) ;D

  You get 2 tarps when done. Take this tarp or similar and fold in half lengthwise. Cut it in half at that seam.

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Using a good brand of duct tape ( I like Gorilla Brand)  Run tape on BOTH sides of the tarp(s) seam you cut.

Then buy some some of these:   (You need to Login or Register

  Match the plastic grommets on the duct tape edge with the ones on the finished tarp edge. Use whatever you like to attach the tarp sides together.