Here are some of the DVDs I 've bought over the last couple months as well as a few classics, I don't know if they are available on Netflix:
Shogun's Samurai (which I still have not got around to watching, but which has Toshiro Mifune, Sonny Chiba, and Tetsuro Tamba so it has to be good.)
Samurai Fiction a little on the lighter side, with some scenes which were just hilarious, but enjoyable still.
Zatoichi Meets Yojimbo featuring Shintaro Katsu and Toshiro Mifune, not to mention most any of the many other Zatoichi films with Shintaro Katsu.
Incident at Blood Pass also featuring Shintaro Katsu and Toshiro Mifune
Samurai Rebellion with Toshiro Mifune and Tatsuya Nakadai
Sword of Doom also with Toshiro Mifune and Tatsuya Nakadai
Hara Kiri (Seppuku) with Tatsuya Nakadai
Kagemusha also with Tatsuya Nakadai
Ran also with Tatsuya Nakadai
A couple I want to get sometime...
Goyokin also with Tatsuya Nakadai
Kojiro also with Tatsuya Nakadai
There are just so many...
I hope these give you something to look around for.
There are two books being published / republished this year about samurai films...
Stray Dogs & Lone Wolves : The Samurai Film Handbook
by Patrick Galloway
List Price: $19.95
Paperback: 240 pages
Publisher: Stone Bridge Press (May 15, 2005)
ISBN: 1880656930
Finally, a book about the ever-popular genre of samurai film. Stray Dogs & Lone Wolves provides essential background on the samurai warrior in Japanese culture to help explain what makes these tales of loyalty, revenge and explosive swordsmanship so watchable. It covers top directors and stars and has over 50 original reviews of a wide variety of films, from classics like Samurai Trilogy and Yojimbo to influential films like Lady Snowblood, plus newly released hits like Takeshi Kitano's Zatoichi. With American directors like Quentin Tarentino increasingly influenced by Japanese films, this book is as much a guide to style as it is a solid film reference.
and...
The Samurai Film
by Alain Silver
List Price: $40.00
Hardcover: 320 pages
Publisher: Overlook Hardcover (September 8, 2005)
ISBN: 1585675962
(Probably can find used copies of the earlier editions of this)