Mwave offers the HP Slim Wired USB Keyboard in Black, model no. 505060-371, for $15.99 with free shipping. That's the lowest total price we could find by $8. This 104-key keyboard features volume control.
Groupon cuts up to 73% off a selection of new and refurbished iPhones, tablets, electronics, accessories, and more during its Tech Sale. (The banner mentions up to 45% off but we've found deeper discounts within.) Shipping starts at $3.99 or get free shipping on orders of $24.99 or more. A couple of best bets, each with free shipping: