I've looked at some steel guitar loops before, but haven't found anything that's really very usable. However, I know a great steel player that I've worked with before and I'm sure you could get him to play the parts for a pretty reasonable amount. He lives just outside of Nashville and another mutual friend of ours has a ProTools studio and they do a lot of long distance tracks for folks. I use them for for steel guitar, country lead guitar (Forrest Lee Jr is awesome country guitar) and they can also bring it great fiddle players, drummers, etc.
Usually they can do an entire song for a few hundred bucks (for pretty much any country instrumentation). Anyway, if you're interested I can put you in touch with them.
Martin is the Steel Guitar player....you can see him playing on this youtube video
http://www.youtube.com/watch?v=3jOMB2M9piw And Forrest Lee Jr plays guitar and is a great country producer ...check out his youtube video here
http://www.youtube.com/watch?v=xIzFo_UrD64 (yeah, that's me on bass....gotta get my plug in too )
Hope this helps...