Cheap Tack Trunks for sale?

Does anyone know of a place to buy cheap tack trunks? I need it to be big enough to fit my western saddle, two bridles, eight splint boots, four bell boots, a saddle pad, a fly sheet, and various grooming supplies. It also must not rot if it gets a little wet, and must be lightweight enough for me to lift and/or drag by myself (I am strong, but not superwoman). I am looking for something under $300, and it would be nice if it came with a way to lock it, but I can install a lock if I need to. Wheels would also be nice, but not a necessity.