DGX Sparks Founder Edition Sold Out (How can I purchase more)

Does anyone know where the DGX Spark Founders Edition is currently available at retail price? I’m seeing a lot of marked-up listings on Amazon, which is frustrating—we need two more units to complete our cluster and would consider purchasing four if future availability is uncertain.

These systems have helped keep our company afloat, and adding a few more would make a real difference. Any leads on authorized retailers with stock, or information about upcoming restocks, would be greatly appreciated.