Arizona Resources:

PHOENIX:


Bargain Store Equipment (website)
(new and Used)
Same Address "Store Fixtures and supplies"

Surplus Asset Management (website)
(auctions and Liquidations)

Gershel Bros (website)
(new and used)


The Fixture Zone (website)
(fixtures only, no gondola)

TUCSON:

Tucson Store Fixtures (website)
(they mention used fixtures, but NOT gondola)
You will find more dealers in Los Angeles and Dallas. Phoenix is right along I-10 and I-8, and this means cheap shipments from either state.  New Mexico and Vegas don't really have used gondola dealers, but they are worth scanning for liquidations.

Trucks are constantly passing by Phoenix, Tuscon and (to a lesser extent) Flagstaff, which drastically lowers shipping costs to/from Texas and California dealers.

All the major cities, Phoenix, Flagstaff, Scottsdale and Tempe are relatively close, so used retail shelving can be found closeby. 

Being in the middle of all this activity really helps when you want to seek out a liquidation sale.

Phoenix will have a relatively strong showing for fixture and used Lozier dealers.  The AZ retail market, and nice shipping lanes, have attracted some major liquidators and retail shelving dealers.
 
Try these nearby states:

California

Utah

Texas