I use black nylon covers.
One relatively inexpensive source is digital deck covers:
http://www.digitaldeckcovers.com/
If you use them for a custom cover, I do suggest you add an extra 1/2" or so to each dimension, as they cut things pretty close.
One relatively inexpensive source is digital deck covers:
http://www.digitaldeckcovers.com/
If you use them for a custom cover, I do suggest you add an extra 1/2" or so to each dimension, as they cut things pretty close.