Walmart offers this Bamboo Expandable Kitchen Cabinet Pull Out Shelf for $29.99. Opt for in-store pickup to dodge the $4.97 shipping fee. (Amazon charges the same with free shipping via Prime.) That's a buck below our mention from five days ago and the lowest price we've seen. (It's a current low by $5.) It holds up to 50 lbs. and expands from 11.5" to 17".