Mike, the creator of the HAS has just opened an official pre-order page on his website: https://homearcadesystem.wordpress.com/pre-order/
Adding your name to the list requires no payment, it just “officially” puts you in line to purchase one. Once your number is up on the list, you’ll be notified to purchase. Serious submissions only though please, as many people have been waiting to get one of these. Current pre-orders will be open until February 2019, with shipping before the end of Q1.
More information, as well as all the HAS’ features are available here: https://www.arcade-projects.com/forums/index.php?thread/8027-pre-order-has-v3-3/&postID=127497#post127497