Save up to 25% on Casper Sleep mattresses and sheets on Amazon today only — and 7 other sales and deals happening now Insider Picks writes about products and services to help you navigate when shopping online. Insider Inc. receives a commission from our affiliate partners when you buy through our links, but our reporting and recommendations are always independent and objective. We rounded up the eight best sales and deals happening online today, with savings on Casper Sleep mattresses and sheets, State Bags, and Speck smartphone cases. For even more deals and savings across the web, check out Business Insider Coupons . 1. Save up to 25% on Casper Sleep mattresses and sheets on Amazon Leading mattress startup Casper Sleep delivers impressive comfort and quality for a good price — and the current sale on Casper's wares should serve as an even bigger incentive to buy. As an Amazon Deal of the Day, you can save up to 25% on mattresses and sheets. The Amazon deal is even more appealing than the current 10% off promotion on Casper's website , but it is limited to today only, so don't miss out on this deal.