A typically good clearance range from DevotedDVD.com.au. The 4-disc documentary 'Shoah', about the Holocaust, is a bargain at $9.95 (plus shipping).
Some good foreign, cult & Aussie films among clearance titles (listed here, ascending from cheapest):
http://www.devoteddvd.com.au/index.php?route=product/option&…
Limited time (1-3 days), apparently. Note the 'Available Options' choice for Clearance price on each title's page.
I once sat though a whole screening of Shoah…… harrowing indeed…