Are the frames steel? Because I hated the Road *Flags* kit. It had flimsy aluminum rods that flaked apart in no time (and edges broke off), and I hated the elastic "cords"(?) inside when trying to put it together with the fabrics. Which you have to thread through the rods, BTW. Awful.
I usually get my cloth and rags from Modern Studio but i've used other brands like Chimera and even DIY stuff from local fabric stores. A la carte is a solid option for these 4x4 frames I feel.