Everything listed here right now is commercial, and many are availiable for preorder/sale here.

Kabuto: see R
Kaidohmaru - Manga Ent
Kakugo no Susume - Media Blasters
KareKano - RightStuf
Kaze no Yojimbo - Bandai
Kazemakaze Tsukaikagi Ran - Bandai
Kenji's Spring - Tokyopop
Keroppi - Sanrio
Key the Metal Idol - Viz
Kiddy Grade - FUNimation
Kiki's Delivery Service - Disney
Kikaider - Bandai
Kimagure Orange Road OVA - AnimEigo
Kimagure Orange Road TV - AnimEigo
Kimagure Orange Road: Summer's Beginning - ADV
Kimba The White Lion: Symphonic Poem - RightStuf
Kimba, New Adventures of - Geneon
Kimba, the White Lion - RightStuf
King of Bandits Jing - ADV
Kinnikuman - 4Kids
Kino no Tabi - ADV
Kirby - 4Kids
Kishin Corps - Geneon
Kishin Heiden - Geneon
Knight Hunters (Weiß Kreuz) - Media Blasters
Knight Hunters Eternity - Media Blasters
Knights of Ramune - CPM
Knocking on Heaven's Door (Bebop Movie) - Columbia
KO Beast Century - RightStuf
Kodomo no Omocha - FUNimation
Koihime - Nutech
Kolaida Star - ADV
Kurogane Communications - Media Blasters

==ADULT SECTION (18+ ONLY)- shop here

Kama Sutra - Kitty
Kekko Kamen - ADV
Kimera - ADV
Kite - Media Blasters
Kizuna - CQC
Koihime - NuTech

For another letter, go here.
For a general exit, go HOME...