Amazon Prime Day runs from July 8 to 11, and it’s a feeding frenzy for beauty steals, so I’m here to help you spend your money semi-responsibly. I’ve combed through countless hot tools, dental devices, and skin care gadgets to find the best Prime Day beauty deals. If you're shopping for other gadgets and gizmos, check out our Best Prime Day Deals roundup or our Prime Day liveblog. At $40 for Prime Day (down from $50), it's the one I'd grab. Regularly priced at $17, it’s now available for nearly half off during Prime Day, an opportunity to stock up on this cult-favorite slime.