ebates has a Prime Day deal today where some of their affiliates stores have significantly increased their cashback bonus for today only. That includes Walmart.com and Samsung.com
If you haven't used ebates before, you start your shopping at the ebates site or app, then use their link to go to the site you want to shop at. They credit you with a cashback bonus for most items purchased on that visit, typically one or 2% but today, for example, it's 5% at Walmart. Then once a quarter they give you that cash as a PayPal transaction. There are a few restrictions, like no cashback on gift cards.
These rebates almost always stack on top of any other sales that the stores running, so it's just a little bit extra back, but everything helps.
Walmart has some home automation devices, as well as regular home-improvement and entertainment items. Good price on the Hue go today, for example, plus the extra 5% from ebates.
Just read the Walmart product descriptions carefully, I don't think the eBates program applies to the third-party sellers that Walmart has in the marketplace, just items sold by Walmart itself.