retail: $35
$16
Amazon has the Emsco Group City Pickers 2343-1HD Patio Raised Garden Bed Kit (Limey Green) for $26 - $10 off coupon (clip green coupon) = $16 with free shipping on $25+ or with Prime.
Features embedded watering system, casters for easy movement, and measures 24.5" x 20.5".