Walmart offers the Mainstays 5-watt LED Desk Lamp with Qi Wireless Charging in several colors (Black pictured) for $11.88. Opt for in-store pickup to avoid the $5.99 shipping fee. That's $8 off and the lowest price we've seen for an LED lamp with wireless charging capability. It's compatible with most Qi-enabled devices and features an adjustable gooseneck and USB charging port.
One grocery chain is likely to save you more money than any other.