kinda depends on what kinda tools you want to store.
used toolboxes can be found cheap (sometimes) on CL, garage sales, flea mkts, and estate sales.
bigger, bulkier powertools, filing cabinets, kitchen cabinets/countertops.
sometime a drive around the neighborhood, the night before trash pickup, will turn up something, as will dumpster diving.
i picked up a couple a metal wall cabinets, a 4'x8' x38" wide table make of 3/4" & 1/2" plywood, and a homeowners 4ft workbench( still in the box) on trash day.
i use both the cabinets in the garage, and the wife uses the workbench for her gardening stuff. i cut the big table down to fit in the space available in the garage.
