The reply I got to my support email from yesterday is below.
Things like this make me stand by Anker (& Eufy)! Products are great! Customer Service is great and does right by you!
Can’t wait for the newer USBC PD battery banks!
** From Email **
Thanks for contacting customer support.
We appreciate your calling in about the deal on Anker website. The deal was at a really low price so the quantity was limited and first come first served. RoboVac 11+ for the deal was sold out quickly. Due to some issues with the Amazon listing, the promotion was canceled by Amazon automatically.
We are dealing with this problem now.
We appreciate your support for Eufy so we are happy to offer you the same discount for one RoboVac 11+. Would you order it from Amazon then let us know the order#? We’ll issue a partial refund on the order to make the product price equal to $159.99.
… What’s more, we will have another promotion later in December, when the stock is replenished. Maybe you don’t mind waiting for some days?