Use the coupon code 15NOW for 15% off, then wave the free return for a few more cents discount.
The main YMMV on this is if you live in a state where jet.com charges tax, this should bump up the total price to just over 50 dollars.
The other YMMV is if you still have the amex twitter offer for 20 off 50. I just checked on this and it appears to be unavailable now.
I was able to check out with tax in UT for 50.60 total and with the amex offer I'll be sitting at 30.60. Best price I've been able to come up and beats lowest I've seen by a few dollars. But very YMMV