I like the cutie in the Yahoo ad.
And: Gas
When to Buy: Thursday, before 10 a.m.
Why: The price of oil isn't the only factor influencing costs at your local pump. Consumer usage plays a role, too — and weekend demand is high, says Jason Toews, co-founder of GasBuddy.com, a price-monitoring site. Prices usually swing upward on Thursdays as travelers fuel up to head out the following day. By hitting the pump before 10 a.m. (when many station owners change their prices), you'll beat the rush and the price jump.