For its members, Costco discounts a selection of Kirkland Signature Men's Dress Shirts, with prices from $9.97. (Non-members pay a 50-cent surcharge.) Plus, all orders bag free shipping. That's the best price we've seen for these shirts by at least $3, and a great deal for any men's 100% cotton dress shirt in general. Save on button-down and tailored styles in both regular and big/tall sizes.