Seconding Jo-Anns. They've got an upholstry section in the back that usually has a couple dozen rolls of pleather in various colors and textures.
Alternately, go to your local Goodwill and check through their leather coats for one to cannibalize. They usually only run $10 or $15, which may be even cheaper than a few yards of pleather; and real leather just looks so much nicer!