The Old Glory 15s site says that their sale from September has been extended through November 30, 2008.  As they describe the sale on their web site:

From now until the end of November, you may receive the following on all products that we manufacture on our website:

Orders of $101-399 will receive 30% off
Orders of $400 or more will receive 40% off

Regular shipping charges apply. Shipping for orders over $100 after the discount is applied is always free in the continental US.

For more details or to place an order, see their web site.