Auburn:

Warehouse Solutions NW
(website)
Renton:

Northwest Handling Systems
(website)
(also Union Gap and Spokane locations)

Mr Racks (website)
Sumner:

Rusty Rack Guys
(website)
Spokane:

Norlift Material Handling Solutions
(website)
All used pallet racking dealers, info and sales
-Don't forget to check craigslist (website)
-See if there is a Racking liquidation
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Used Pallet Racking Washington

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Honorable mention to "Rusty Rack Guys" for an honest name.
Used pallet rack almost never sits in a warehouse, it's left outside, in the rain.  In a coastal environment like Seattle, this get compounded somewhat.
Every used rack dealers is selling rusty rack, to some degree.

The state of Washington has, overall, good dealers relative to most states.
The largest city, Seattle, is a pretty bad shipping point to the rest of the USA, so the dealers here want your business.
You can try California dealers if these guys dont have what you want, but shipping wont be cheap.  A phone call or two to Portland is also a good idea.
Write down what you need, then email multiple dealers for the best price!!
How tall? (upright height)
How wide? (beam length)
How deep? (upright depth)
Weight Capacity per shelf?
Number of shelves per bay?
Zip Code for delivery?
If the dealers in your state can't help, email your nearby states!
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Used Pallet Rack Washington
Washington offers several options for used pallet racking dealers in the bigger cities like Seattle, Bellevue, and Tacoma, but you’ll need to call around to find the lowest prices. The best thing to do is get companies to compete on pricing, which only works in your favor. Be sure to let them know what your needs are for material handling, and remember that used warehouse shelving will save you more money compared to new shelving. Let the companies know exactly what you are looking for, and if you look out of state at dealers in Oregon or California you can expect to spend more money on shipping.
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Monroe:

Continental Store Fixtures
(website)