Walmart offers the Better Homes and Gardens Leighton Twin-Over-Twin Wood Bunk Bed in several colors (Black pictured) for $159 with free shipping. (Hayneedle offers it in Light Cherry for $3 more. Click on "View all available options"; then click on "Frame Finish" and choose Light Cherry to see this price.) That's $40 off and the lowest price we could find, although we saw this at an all-time low for $10 less last September. It converts into two separate twin beds, and features guard rails on the top bunk plus an integrated 4-step ladder.