Rock wall in Vegas?

Mrs Russgrad has informed me that, besides the zip line on Fremont street, she would like to try a rock wall while we're in L.V. in May. Are there any that are not part of an athletic club?
There was one in the arcade next to the M&M and Coca-Cola place, but I don't get down that way much anymore.
There is one on Charleston across from Star Nursery.
Thanks for the info!
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