Black Friday in July Activewear on Sale

At $4, these Aegend arm sleeves are half off the regular $8 price. That's their all-time lowest price on Amazon. They're sold in a 2-pair pack and made from a stretchy nylon-spandex blend that can be machine washed. Prime members get free shipping.  Buy Now at Amazon

REI offers its REI Co-op Men's Midweight Base Layer Half-Zip Top in several colors for $19.83 for a savings of 66% off the list price.  You can grab the women's version here for the same price.  Shipping is free over $60, or you can choose pickup for free at many stores (members will get free shipping outright). Buy Now at REI

Under Armour Outlet's Labor Day Sale is now live. Within, you'll find apparel, shoes, and accessories marked 30% to 40% off. Even better, you can stack promo code "EXTRA15" to get an extra 15% off your order. Some exclusions may apply. Shipping adds $8 or is free on orders of $50 or more. Sale ends September 7. Shop Now at Under Armour

At eBay, use promo code "FIRSTBELL20" to get this adidas Men's Core Performance Primegreen Polo Shirt for $10. It's the best deal we've seen for this adidas men's polo shirt. Shipping is free. Coupon ends August 9. Buy Now at eBay

Ending today, the adidas Men's USA 94 Graphic Woven Track Top is $48 after applying promo code "SPLASH". That's 60% off the original price of this throwback style. It has a loose fit with a full zipper closure and zipper side pockets, made from recycled polyester woven fabric. adidas adiClub members get free shipping on all orders (it's free to join). Buy Now at adidas