If you are not in a hurry i can recommend RC Champ in Japan that can order rare spares directly from Tamiya. They are good ofr all Tamiya cars and TRFs available:
http://www.rc-champ.co.jp/Champ_Inte...onal_index.htm
Also for certain 201, 501, 511, 502 and DB01 parts there is RC mushroom located in HK:
http://www.rc-mushroom.com/
Vellrip in Singapore has also parts for all cars from Tamiya:
www.vellrip.com
RC model in HK is reliable too and has parts for all TRF kits:
http://shopping.rcmodel.hk/index.php