I would give the contrarian advice to re-examine your spending on Amazon and see if other merchants have what you want cheaper and pay portal bonuses.
First of all, do you live in a state where Amazon collects sales tax? That right there is a 5-9% hit to your bottom line. On top of that you either have to pay for prime, or often wait 2 weeks for things to arrive.
I've discovered that I can buy pretty much everything either cheaper, or same price but without the sales tax, and get faster delivery through many other merchants. There are exceptions of course, but to me Amazon is no longer the go-to place. For electronics and photo equipment I usually buy from B&H. A recent large plumbing parts purchase was from build.com, etc..