MoeMall, MatchWigs and Ayanamisatoru (on eBay) are good wig stores. I've personally ordered from all of them and been pleased.
Masamune Date - Sengoku Basara
Sōji Okita (Tsuiokuhen/Trust & Betrayal OVA) - Rurōni Kenshin
*~Next con I'm attending~*
FIN Kitacon (1-2 March 2014)
SAT Keisuke Sannan - Hakuōki: Shinsengumi Kitan
SUN Gin Ichimaru - Bleach