Costco's 18-pack Feit Electric LEDs for $36.99 can cut your electric bill by $269 annually. Here's the math on how these 5-color bulbs pay for themselves.

“Mr. Beaver, for the longest time we wanted to replace all 50 of our light bulbs with LEDs but the retail price of around $12 each was a deal breaker. We have used the little coiled CFLs, which do ...