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on 7/24/16Popular and common sizes sell very fast, usually within a few hours after listing them.The ads are generally a 15-30 day contract with the web site you view it on. I know what you mean though, it can be frustratingwhen you can't find what your looking for. You can also get on the mailing list for new items daily which might help to be first to choose something you like before they are gone.