Here's a link to a metal supplier.

[L6steel]

This place sells 416 rounds in big sizes. I didn't look the site over much but I figured you guys might want to check em out. They'll cut to any length and say no job is too small.
http://www.industrialmetalsales.com/T416_Stainless_Steel_Round_Bar.html

 

[MCoughlin]

awesome link. Thanks.
Mike