For iPhone screen protector suppliers, you can find major brands like ZAGG, Belkin, and Spigen for quality retail options, while RepairPartsUSA offers wholesale tempered glass for repair shops, and manufacturers like Corning (partnered with Apple) supply the actual glass. When choosing, consider tempered glass for protection, explore options like privacy or blue-light filtering, and check for warranty/replacement policies from brands like BodyGuardz.