This is the place where I get mine they sell it in sheets and it's cheap heaps easier to work from a sheet . There used to be heaps of off cuts around as all new boards came with sheets and you had to cut it too suit but now it's already on or the prefab grips are cut to a basic shape so very little off cut.
He has alot more colours than on the web site , don't worry about buying too much you will do more.
www.deckgrips.com/index.htm It's in Byron Bay.