It's funny you should bring this up. I just saw the Curve Master on Massdrop at a 50% discount. Massdrop is a "group buy" site and the more who commit to order, the lower the price can be. They have reached the lowest price on this drop, and it ends in a few days. They will then order from the supplier, and send out orders when they are received.
https://www.massdrop.com/buy/curve-m...4-presser-foot