Where can I buy nylon webbing for lawn chair repair?

I have some lawn chairs, they are in really good shape, except for a few of the nylon webs. You used to be able to buy packs of nylon webbing to repair these types of chairs, everywhere. Not anymore! Does anyone know where you can buy this nylon replacement webbing? I've tried tru-value hardware, Walmart, Dollar General, Big Lots, and everywhere else I can think of.