The special expanded Disneyland Resort Merchandise discounts have been extended through February 1st, 2010.
The Art of Disney Parks
Note, there is a large amount of specific rules and exceptions, so check the link above for all the fine print.
Now through February 1, 2010 all So Cal Select, Southern California and Deluxe Passport holders receive 10% off all purchases at select Disneyland Resort stores. For the same time period Premium Passholders receive a 20% discount (usually 10%).