If one is interested in purchasing rolling storage racks for the garage, it is recommended to check out TP Supply, or Lowes. Both of these sites offer great deals on rolling storage racks for the garage.
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You can buy rolling storage carts at Crate and Barrel. You may also be able to get them at Home Depot. You can check out the Crate and Barrel website here: http://www.crateandbarrel.com/organizing-and-storage/laundry/rolling-3-tier-cart/s650385
There are a number of stores that sell rolling storage carts. These include Amazon, the auction website eBay, Walmart, Home Decorators, Target and Michaels.