i use stacked drawers from walmart. i get the 7-drawer sets. in this photo, the sets are stacked 2-high. (just remove the top from the bottom set, and the top set snaps into place.)
when i don't double-stack, they roll around wonderfully. if i double-stack and fill them, the wheels get all wonky so i have to leave them off.
the double-stacks are in my store-room. i have a few rolling single sets in my sewing area to hold the fabs and tools for current projects. since the drawers come all the way out, i can swap them out between the "current" stacks and the storage stacks so the unfinished projects don't haunt me while i'm working on something else.