BHFO via eBay offers this PowerBody Men's Back Support Compression T-Shirt in Black or White for $11.99 with free shipping. That's the lowest total price we could find for a similar item by a buck. It's available in sizes M to XL, although not in all size/color combinations.
Tommy Hilfiger via eBay cuts up to 40% off sitewide during its 4th of July Sale. (The banner says up to 40% off, but we found deeper discounts within; prices are as marked.) Plus, all orders receive free shipping. Sizes and stock may be limited. A couple of best bets: