Menard's - Shelving & Storage Sale - 12/21
Lowe's has the same unit (mislabeled as 72"W) for $170, but if you bring in the Menard's ad, they will price match the sale price + 10%, making it only $108 and you don't have to muck around with or wait for merchandise checks.
Lowe's - edsal 72"H x 72"W x 24"D Steel Freestanding Shelving
I have 4 of these in my garage and they are rock solid with welded joints, not flimsy stamped steel that twists sideways when you add any sort of a load. The unit is 77"W x 72"H x 24"D, with 3 adjustable shelves. It's not held together with bolts, just gravity -- the shelves slide into the slots on the posts. Each shelf is rated to hold 2000 lbs -- it's as close as you'll get to free-standing commecial shelving in your home at a fraction of the prices. Google around and you'll see comparable units for around $600.
Finally, the units are expandable... you can buy additional shelves and ends separately, and attach them at the end of an existing unit. Lowe's has lots of these components in their shelving department.
Edit - Deal is live again. Sale price is good through 1/2/12.