I agree, thrift stores and Goodwill are your friends! I buy jeans at Goodwill because I cannot for the life of me understand why women's brand new jeans are at least $20 but my husband can buy brand new jeans for $10.
One other money-saving thing that we do is plug everything into surge protectors. We have one for our office that has the computer and printer and everything plugged into it. We have one in our living room that has the TV, stereo, and DVD player plugged into it. Whenever we turn off these electronics, we also flip the switch on the surge protector so they don't continue to use electricity even though they're turned off.