You can't order it from their product page? Or does that lead to their down myshopify webpage? I could add it to my shopping cart as a test but didn't intend to buy so didn't go through checkout. You could call them on the phone & ask whether they're still really using shopify.
Hey, me and my brother have ordered bac4000 controllers from you 2 months ago. Been trying to get in touch with you since. Did you get shutdown or something? Because ghosting your customers is completely unacceptable..
these threads may have other useful info for you:
https://endless-sphere.com/forums/viewtopic.php?f=46&t=96264
https://endless-sphere.com/forums/viewtopic.php?f=46&t=102675