on purchases of $34.99 or more and
Free Standard Shipping on purchases of $34.99 or more applies in the U.S. only. Free Returns in the U.S. and Canada. Large, oversized items and products delivered by special or white glove carriers are not eligible for free shipping or free returns. Free returns are not applicable to final sale/non-returnable items. As always, check the deal's Fine Print for restrictions.
Too early to tell, but so far so good. For those who have the interlock, this is the way to go.
I suggest not getting the insurance due to the cost of calibration. It seems cheaper just to buy another one.