Amazon offers the Furinno Go Green Home Computer Desk in Espresso (pictured) or White, model no. 11193, for $46.67 with free shipping. (Groupon has it for pennies more.) That's $43 off and the lowest total price we could find. It's made of PVC and particle board and has a storage shelf.

Update: The price at Amazon has now jumped, but Groupon continues to offer it for $46.99 with free shipping.