Thanks for the replies!
I took a look on eBay and at Courtesy Nissan to gauge shipping. It appears Courtesy charges about $15 to ship one "nerf bar" and eBayers charge ~$28 bucks to ship two. Please PM me the condition yours are in, and your thoughts on a price? I'm not opposed to shipping, but I know that local pickup would be really convenient... and many members are from my general vicinity.
I'd like to keep the cross bars as I want to get one of the bike racks at some point, sorry.