Do you have a Discover Card? Right now at Amazon, you can get a free $10 or even $20 when you add your Discover Card to your Amazon account. Just check out this page to see if your account qualifies!
I have two Amazon accounts and I had the $20 offer on one and the $10 offer on the other.
These offers can be used on select purchases of $10.01 or more ($10 offer), or $20.01 or more ($20 offer). It looks like the offer can be used on products shipped and sold by Amazon as well as many digital gift cards! I bought a $25 Old Navy Gift Card for my niece and it only cost me $5!
This item will ship free for all Amazon Prime members. Or, regular members can score free shipping by adding $25 or more worth of eligible items to your cart. You can get a 30-day free trial of Amazon Prime here.