Popsugar Tech Affordable Shopping Best Affordable Gadgets From Walmart These 16 Essential Gadgets Are Under $50, So You Might Just Need Them All 5 March 2019 by India Yaffe View On One Page Photo 13 of 16 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 13 Mini USB Car Essential Oil Diffuser Set the mood everywhere you go with this Mini USB Car Essential Oil Diffuser ($21). It even plugs into your car. Mini USB Car Essential Oil Diffuser $21 from walmart.com Buy Now Previous Next Start Slideshow ShoppingAffordable ShoppingWalmartGadgets