CD Japan - The top importer for J-Music CD's and DVD's
YesAsia - The best stateside store for small orders. Note: all "Overseas Versions" are completely legal. Associate link
Amazon Japan - Preordering DVD's here will save up to 20%. Associate link

Tofu Records - Sony's US J-Music label

Avex Network - The record label for the majority of J-Music guests
Sony Music - The other record label active in bringing over guests

Red Apple Productions - J-Music fansubbers