Walmart offers the Furinno Bamboo Adjustable Notebook Lapdesk, model no. FNCL-33009, for $24. (Amazon charges the same.) Opt for in-store pickup to dodge the $5.97 shipping fee. That's tied with our mention from a week ago as the lowest price we've seen. (It's the best deal now by $9.) It's made from bamboo and features foldable legs.