My new layout will have ~200 feet of Atlas track and ~23 switches from O36 to #5. About 85% of it was purchased used from the OGR Buy/Sell Board or train meets. The switches were all purchased at no more than 50% of retail and the track was purchased at less than that. The last bunch was purchased at the Fall 2019 First Frost meet. Someone was selling 40 10" straight sections and a dozen or so 4 1/2" straight sections. It was essentially brand new from a layout that never got built. I paid $175 for all of it.
You can search the Buy/Sell board for "Atlas track or Atlas switch". Those that haven't been deleted will give you an idea of how much is too much as will the completed listings on ebay.
It depends if folks want it now or are willing to wait.
What 'ctr' posted above is sound advice imho.