www.ebay.com Don't forget Ebay - Great place for picking up those used odds and ends you may need - also a great place for buying a bike!
www.speedandsportinc.com Great Place to buy vintage (NOS) parts for your RD200 and all other Yamaha hard to find parts regardless of the year.  They also make great reproduction decals.  Very helpful staff - they go way above and beyond (Thanks Shelly and Andrew!!!).
www.nwvintagecycleparts.com Hard to find New Old Stock Vintage Parts for Yamaha and Kawasaki Motorcycles. Ask for Mark!
www.sunrisegraphics.co.uk Sunrise Graphics specializes in reprinting obsolete and unobtainable decals for the restoration of Classic Japanese motorcycles
www.reproductiondecals.com Reproduction Decals specializes in reprinting obsolete and unobtainable decals for the restoration of Classic Japanese motorcycles.
www.RDdecals.com Decals for your RD200 tank and side covers.
www.motorcyclerepairmanual.com Source for Repair Manuals
www.oldbikebarn.com The Source for 70s, 80s & 90s New Japanese Motorcycle Parts.
www.hvccyle.com A source of RD parts for your restoration. They have the site gauge (gauge, level) for your oil tank among other hard to find items.
www.customplatingspecialist.com This company did the chrome work on my RD200's, it was the best looking chrome I have ever had done. I highly recommend these folks!
www.vjmc.org You are not alone - there is a whole club devoted to Vintage Japanese Motorcycles - I highly recommend joining this club.  You will meet people in your area with the same interests, get troubleshooting advice, and get a great magazine!
www.puleracollision.com Pulera Collision did the paint work on the RD200A and the job was spectacular. I don't think they seek out motorcycle paint jobs but they could probably work you in if your willing to be flexible on the timing.