I bought some from http://www.trukey.com/metric.htm

JohnM wrote:
Mike Haaland wrote:
Hi,

I'm looking for a source for 10mm 303 Stainless Steel Rod.
Anyone have a US or Canadian Supplier?

Thanks,

- Mike -

Try these people, I bought some stainless from them a few years ago and
they were pretty reasonable. I don't know what alloys they have, you'll
have to ask.

http://www.madsenwire.com/company.htm

Dunno if they'll ups it to you or not, bet if you buy enough they will.