I have purchased S 'glass from Sweet Composites a number of times: http://sweetcomposites.com/Fiberglass.html
The style 6533-60 cloth is 6 oz/yd and the 6522-60 is 4 oz/yd. Both are a full 60 inches wide and a yard would probably be more than enough for your purposes.
Sweet Composites also sells West Systems epoxies: http://sweetcomposites.com/WEST.html You could use either conventional epoxy or G Flex. If you use conventional West 105 resin I would suggest using the 206 slow hardener. Unfortunately you have to buy no less than a quart of resin, although it is very handy stuff to have around. A quart of 105 with the appropriate volume of 206 hardener costs $54 at Sweet. But for convenience you will probably want to buy a set of minipumps as well and that tacks on another $13.
Alternatively you could use G Flex epoxy and Sweet sells 16 oz of G Flex resin and 16 oz of hardener for $54. G Flex is more viscous than West 105/206 so it takes a bit more time to work it into cloth to initially wet it out but it will work fine. I would only wet out one layer of 6 oz/yd cloth at a time, though. An advantage of G Flex is that you don't need pumps to mix it. It can be mixed 1:1 by volume by eye. This makes it very convenient to mix up very small batches which is quite handy when you are filling in and fairing small dings and divots in the hull before applying a plate or a patch.
Sweet also sells Dynel cloth: http://sweetcomposites.com/Polyester.html
Dynel is less expensive than S 'glass and makes a very nice abrasion plate. Dynel soaks up more resin than fiberglass of comparable weight so a single layer of 5 oz/yd Dynel is enough.
I like to mix graphite powder in with the epoxy for abrasion plates. A twelve ounce can (which is a lot) costs $17: http://sweetcomposites.com/WEST.html
The graphite is said to make the cloth more abrasion resistant and it gives an abrasion plate a nice gloss black color that looks good and protects the epoxy from photo-degradation.
Another vendor is Jamestown Distributors and they have free shipping on orders over $50 till midnight tonight. They sell E 'glass and Dynel cloth as well as West Systems epoxies: http://www.jamestowndistributors.com/userportal/search_subCategory.do?categoryName=Fiberglass%20Cloth&category=520&refine=1&page=GRID
I do not believe they sell S 'glass.
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