Sportsmans guide, midwayusa, northlander and Shilen
I've ordered savage barrels from all of them and all cases have gotten top notch products and service.
In my opinion if you don't already have any of the tools the kits from sportsmans guide are your best bet. These rebarrel kits come with everything you need to swap out the barrel on your Savage in 20 minutes on your kitchen table for only slightly more $$ than the bare bbl from other vendors