There are two places I've used, for aftermarket and a little custom.
http://www.bikesdecals.com/
These guys used to be on eBay for years, I've bought 3 sets of custom color 09 boxxer kits off them, the amount of time and effort that goes into these stickers are quite amazing, and the range is quite extensive, they have current boxxer replacement stickers so check them out.
www.slikgraphics.com
These guys I've used once, mainly because they were down for some time with the fella that does the work away for some time, the quality of these is another step again, 200% you could say over oem stickers. Unfortunately the range is quite limited, and I would love to see a morewood kit made.
And the big + for both above companies is that they are much cheaper than the oem counter parts. Happy hunting.
Otherwise I would reconmend maybe being nichos slave for a couple weeks and maybe you could get his idyle rares or get some 40s I'm glad I made the change.
Anyways happy hunting