Vandue via Rakuten offers the Popdesk Height-Adjustable Desk Surface for $84.88. Coupon code "HOME20" cuts that to $67.90. With free shipping, that's the lowest price we could find by $41. It measures 27" x 19.25" and supports up to 30 lbs. Note: This coupon can only be used once per account, with a maximum discount of $40. (You must be signed in to use it.)
You don't need to hire a contractor or do extensive renovations to add value to your home.