As one of its daily deals, Tanga offers five Men's Uniform Piqué Polo Shirts in several color combinations (Black/Navy/Green/Blue/White pictured) for $33.99 with free shipping. At $6.80 each, that's tied with our November mention and $11 under the best price we could find for this quantity of similar polo shirts sold elsewhere, excluding the below mention. They're available in sizes S to XXL.

Note: This item ships is scheduled to arrive in 10 to 20 days. Also, Aeropostale offers its Aeropostale Men's Solid Uniform Piqué Polo Shirt in Bleach for $5.99 each. Add five to cart and apply coupon code "EXTRA30" for a price of $20.95. With $5 for shipping, that's $5.19 per shirt. It's available in sizes XL to 3XL.