Never buy a water flosser for less than 30 percent off, but if you wait for Prime Day the discounts typically reach 50 percent. The same is true of teeth-whitening kits, electric toothbrushes, and more of our best dental-hygiene products — never buy them full price, and wait to buy them during Prime Day if you can.

Read more: The Best Water Flossers, The Best Electric Toothbrushes, The Best Teeth-Whitening Kits

CosRx’s much-loved snail-mucin essence is almost always on sale for around $20 (down from $25). The only other times we see it for less are during sales events like Prime Day or one of Ulta’s semi-annual sales. The same goes for most drugstore holy grails like CeraVe night creams, Maybelline concealers, and Neutrogena cleansers.

As for pricier beauty, it’s best to wait for Prime Day or Black Friday. The Clinique Black Honey Lipstick, Laneige Lip Sleeping Mask, and EltaMD UV Clear Sunscreen are just a few top sellers that get their lowest prices on sale holidays. Big-ticket hair tools from Shark, Dyson, and Drybar often go on sale (usually for around $100 off) pretty frequently, too, and they’ll all see big discounts on Prime Day.

Unless you’re holding out for the latest tech, you can often get it on sale. We see a variety of Beats headphones, older AirPods and iPads, and smart watches with discounts of around 20 to 30 percent off every day. And as is the case with most products, these items (and even other newer, trendier ones) get their best prices during sale holidays. Prime Day is a great time to buy (I suspect everything below will be discounted come June 23), but Black Friday is even better: Our tech writer Jordan McMahon says you won’t find a better deal on tech than during Cyber Week.