Well here are a few
cosplayuk.co.uk
http://www.myimportstore.com/index_Section_1.htm
http://www.399cosplayshop.com/japanese-anime-cosplay-costumes/final-fantasy-cosplay.php
http://www.lightinthebox.com/wholesale-Final-Fantasy-Cosplay_c2294
http://www.mooncostumes.com/cat/301?pcat=
there are more if you'd like to know ^^