And just while we were talking about this: Adbusters' 3/50 campaign.
Choose three local businesses you can't bear to see go under. Spend $50 a month between the three and help keep their doors open.
As long as at least one of the businesses is selling day-to-day necessities like food or hardware, $50 a month is do-able for most people.

My challenge: choose businesses besides my favorite local restaurants.