As one of its daily deals, Amazon offers the Nordic Track C 700 Treadmill [amazon.com]
for $549.99 with free shipping. That's the lowest price by $325. It folds for easy storage, and features a 20" x 55" tread belt, 20 workout apps, iFit compatibility, and multi-window LED display. Deal ends Wed 1/3/18 @ 3AM EST.