The cost depends on what you want/need. You can order just the bed cores without the frame and hinge (you transfer them to the new cores) or you can order the complete assembly with the frame and hinge.
A couple years ago the cores were $210 plus $25 for crating plus freight. The complete assembly was $330 plus $40 for crating plus freight. That's for each door.
You'll also need the decal and a bed seal replacement kit.
Here's a link to pictures of what's involved in replacing the bed doors:
Contact Sherri Dunlap at FR for the parts for a Roo:
(574) 642-2640, ext 136
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)