Not sure about renting, just purchasing.......
My understanding is that the vast majority of the reamers sold here are still manufactured in the US. I'm sure there are places here that could make one given a proper drawing, but likely cost prohibitive.
I went through this exact thing, figuring I needed one from here due to shipping out of the US. But the wise men of AO informed me that's not the case. So Pacific Tool & Gauge packaged me up a 338 Federal and shipped it right to my door at work.
http://pacifictoolandgauge.com/137-c...reamers-nopix-