Dante-

470 brass will likely only be found at Huntingtons.
Call or email them first to make sure they will have some in stock.
Shops who stock extensive reloading components are few and far between here in the state, and of shops who actually do stock *even very good selections of reloading supplies* typically don't stock NitroExpress brass due to very low demand and very high price.
It looks like Huntingtons lists Norma 470 brass. Whether or not they have any in stock is another story. Call them and email them right away and see if they have any in stock, how long it would take to get some if they don't, and if they do have some, if they will hold it for you until you can get there in person to pick it up.

If Huntingtons is a bust, scrub the dealers on the WWW such as midway and grafs, call them and see if they have any in stock, and if they do, consider talking to Tyler at Sportsman's Access, Bob at Old West or Chuck at Contra Costa Collectibles and see if you can get them to let you pay them to order it and have it shipped to their shop next day air for you.
470NE brass is expensive, and if you buy in quantity the extra cost of next day shipping won't be significant to the final per-piece cost -- and you may actually be able to end up getting some to take home with you.

I don't shoot the 470, and I'm not familiar with any tricks or possible surrogate brass to form into 470 if you can't find any, but if you start a thread on it you might be able to get a quick response from someone here who does.

Good luck to you on the brass search. It might take some fast foot work from your end to make this come together for you before you go back home, but I think you have a chance.

Also, thanks for the encouraging words on the knee surgery.
There's some pretty extensive cartilage damage in there too, and I have my fingers crossed on my recovery possibilities with that in particular. I had one of the best surgeons in the state do the work, and I'm confident that I'm getting the best chance I can on a solid, reliable, full recovery.

--Tinker