Help me out here guys. I mentioned what was being discussed here, with my wife (subscribing to household items, etc.) and she had me look up some things. Almost every one of the things we looked up (a few grocery items, laundry stuff, and paper products) she said seemed higher than what she's paying. What sorts of things are you all buying that's cheaper than Sam's Club and Walmart?
If you're looking at Bounty and Gain, the prices may not be any better. If you have allergies in the family, and need to buy brands like Seventh Generation, etc., you'll see the savings over other places where those things are available. Same with food. Campbell's soup, maybe not so much; Wolfgang Puck's organic soups, however, big difference, especially w/ Subscribe and Save.
Also, outside of the grocery zone, you have things that Walmart and Sam's Club (I also frequent both) don't carry. I've never seen Maxpedition, CRKT, Magpul, Fenix, etc. at either.
Also, the supplement selection on Amazon is incredible. It's rare I find a better deal on the kinds we need.
If you've checked the prices on the things you buy, and can't find the benefit, it may not be that great for you. As with anything, it's not a fit for everyone.