Amazon has the COOFANDY Summer Tank Tops Sleeveless Muscle T-Shirt (lots of colors and sizes) for $9.99 - 5% off coupon (check "Apply 5% coupon") - $3.50 off with coupon code RE7GIP4Z at final checkout = $6.49 with free shipping on $35+ or with Prime.

Amazon promo codes don’t always work on the first attempt. Try refreshing the page and re-entering the code.