Amazon offers Prime members the Furinno B&W U-Shaped Laptop Desk in Black, model no. FNBJ-22032-1, for $18.99 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $11.42.) That's $3 under our mention from last month and the lowest price we've seen. (It's also a current low by $3.) It measures approximately 19" x 12" x 24" and features rolling caster wheels.
Note that it's expected to ship in one to three months.