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Try a search on the boards. There was someone who mentioned a few speciffic dealers who carry the new Hornady rounds. Other than that, reload or scour the gunshows.
I think it's possible to form brass out of 7.62x54R, or 45-70 as already mentioned. Check surplusrifle.com, I though I read an article on forming 8x56R brass a while back
I would forget the notion of finding ammo unless you intend to shoot very little (and who does?). There used to be a fair bit of milsurp ammo around but it's pretty much gone (although I have a couple of hundred I'm saving as collector ammo).
In the last couple of years this has become a piece of cake (for reloaders anyways). I go to Dave Friesen www.bcredneck.com for Graf brass and Hornady bullets, and to Andrew Higginson www.higginsonpowders.com for Lee dies and the Lee 0.329" bullet mold. You'll also need a few clips which exist here and there.