Amazon offers the GE Nighthawk Platinum Headlight Bulb 2-Pack, model no. 9007NHP/BP2, for $22.64. Click the "Clip coupon" button and it falls to $12.64 at final checkout. Plus, Prime members bag free shipping. (Non-members can get free shipping with orders of $35 or more; otherwise, it adds $5.58.) That's the lowest total price we've ever seen without rebate hassles, and a current price low by $19. They purport to give up to 90% more light than standard halogen bulbs. Rebate expires January 31.

Update: The price has dropped to $20.63 before the above coupon, $10.63 after.