REI cuts up to 65% off a selection of men's, women's, and kids' bike helmets. Choose in-store pickup to avoid the $5.99 shipping fee, or get free shipping with orders of $50 or more. Sizes and stock are limited for many items. A couple of best bets, both via pickup: Stocking up? Take 20% off when you spend $100. (Discount applies in-cart, and eligible items are marked.)