My husband made these twin headboards for our two youngest and we are selling the woodworking plans. The materials for each one are only about $25 (plus whatever finishing supplies you use)! There is one set of plans and it includes the variations for both designs.
I've also started a Facebook page for Iron Timber: facebook.com/irontimber
It's the interest in the posts on this blog that convinced my husband to sell his designs. :)