Walmart offers the LEGO Creator Space Shuttle Explorer for $23.99. Opt for in-store pickup to avoid the $5.99 shipping fee. (Amazon changes the same with free shipping for Prime members, while Target charges the same via pickup.) That's tied with our mention from December and the lowest price we could find by $6. This 285-piece set can be rebuilt to make a Moon Station or Space Rover, as well as the Space Shuttle.

Update: The price has increased at Walmart; however, Amazon changes the same with free shipping for Prime members, while Target charges the same via pickup.