The Store Fixture Store - (website) (Used Store Fixtures, maybe gondola) Tulsa:
Store Fixtures of Tulsa (website) (new and used fixtures, maybe gondola)
I found a couple store fixture dealers/liquidators in Oklahoma, but they don't mention gondola style, which often means they're a hit-or-miss prospect to have what you need.
Check craigslist (website) locally for store fixture liquidations in Oklahoma City, Tulsa, Lawton, Stillwater, and the NW region of Oregon.
If your local search fails, you'll find dealers and liquidators in Texas and Missouri, along with more opportunities to find a closing store
