Ok, this deal is very much YMMV, but I was just able to take $30 off of a $50 Amazon order by stacking two different deals. This REQUIRES a Chases Sapphire reserve credit card.
There is a deal with the Chase Sapphire Reserve that lets you take $15 off of any $50 if you are eligible. This deal is already posted on slick deals, so I just pasted the link below.
Amazon is also running a separate $15 off of $50. If you buy $50 of any of the various items at the link below, and are eligible for the Sapphire Reserve deal, you can get both $15 dollar offers taken off of the same purchase.,,,,that's a total of $30 off of a $50 purchase!