A lot of comic book stores carry manga collections and anime on DVD or Blu-Ray, so you could try Powers Comics at 2180 South Ridge Road, tel: 920 884 8483
Saturday 4th is Free Comic Book day, so you may well be able to pick up some good manga titles.
There are a couple of costume shops, but they seem more aimed at western-style fancy dress and *cough* bedroom cosplay, so may need to look for these online.
Google Directory Cosplay http://www.google.com/Top/Arts/Animation/Anime/Fandom/Cosplay/ Anime Costume resources: http://anime.about.com/od/cosplay/tp/aa12.htm Google Directory Cosplay http://www.google.com/Top/Arts/Animation/Anime/Fandom/Cosplay/ Anime Costume resources: http://anime.about.com/od/cosplay/tp/aa12.htm
Google Directory Cosplay http://www.google.com/Top/Arts/Animation/Anime/Fandom/Cosplay/ Anime Costume resources: http://anime.about.com/od/cosplay/tp/aa12.htm
Google Directory Cosplay http://www.google.com/Top/Arts/Animation/Anime/Fandom/Cosplay/ Anime Costume resources: http://anime.about.com/od/cosplay/tp/aa12.htm
Anime conventions are your best bet for cosplay. That or Harajuku Japan.
Google Directory Cosplay http://www.google.com/Top/Arts/Animation/Anime/Fandom/Cosplay/ Anime Costume resources: http://anime.about.com/od/cosplay/tp/aa12.htm
You should cosplay your favourite character from a game or anime or anything in general.
Google Directory Cosplay http://www.google.com/Top/Arts/Animation/Anime/Fandom/Cosplay/ Anime Costume resources: http://anime.about.com/od/cosplay/tp/aa12.htm
Dressing as a character from the anime "Naruto."
Cosplayers...anime freaks...ME!
Heroes of Cosplay - 2013 Anime Matsuri 1-4 was released on: USA: September 2013
I think your best bet would be to try a cosplay suggestion program.
Cosplay (short for Costume Play) is dressing up as a specific character, usually Anime characters.