Amazon.com offers the Sylvania 23-watt 120-volt CFL Mini Twist Bulbs 6-Pack
, model no. 29490, for $14.73
. Add $6.26
for shipping, or spend $25 or more to qualify for free shipping. Even with shipping, that's $3.50/bulb and the lowest total price we could find by $8. These bulbs are Energy Star approved and provide up to 12,000 hours of light.