target has the GE energy smart light bulbs for $2.99
Here is an example
GE Energy Smart 13-Watt Mini Spiral Compact Fluorescent Light Bulb
use
$2 off 1 Target coupon
and a
$1 Manufacturer's coupon at www.coupons.com here is a direct link for FF
Here is a direct link for IE
$2.99 - $2 Target coupon = $1 - $1 Manufacturer coupon = $0
You can print several Target coupons and two Manufacturer's coupon per link above per computer
At first I did not notice that the $2 MC , although is working for single pack- don't encourage you to use it, is for multipack (thanks to people who pointed it out) so you can still buy two and use the $1 MC in addition to the $2 Target coupons to get them for free.
You can repeat the deal above for as many computers as you have.