I just bought a 2010 Xterra X.
I didnt get the cross bars with the roof rack...
Is it suppose to come with it attached?

No, according to the 2010 Nissan Xterra site for the X model. :(
http://www.nissanusa.com/xterra/specifications.html then check exterior
Welcome to the club.

as Fzzt said, aperrently not for trim leavel X but im sure you could have negotiated them into the cost.

I have an X and it didnt come with them either. I remember going into the dealership like a year later to ask about how much they were...even the parts guy didnt know that the X model doesnt come with them. Anyway, I wound up getting them like 2 weeks ago from www.fontananissanparts.com They were waaaaaaaaay less than from the dealership. You can PM Fontana on here, He'll help you out.

There was a guy on Ebay selling them OEM new stock and cheap. Do an ebay search. I know because I saw them when looking for spares for my 1st gen and this was within the last 6 months which means in car parts terms he probably still has them

CISO

I just bought two from nissanpatsshop.com for $88 each. now i need to figure out the spacing so that when i put on my yakima fatcat6 snowboard rack.. the spacing will be right...can anyone measure the crossbars spacing and let me know?