This is a pretty good discount from 4WheelParts.com:
$50 Instant Rebate on kits $1000 or less PLUS $50 Off Installation
$150 Instant Rebate on kits $1000 - $1999 PLUS $150 Off Installation
$250 Instant Rebate on kits $2000 or greater PLUS $250 Off Installation
Get your installation discount when you have your kit installed at one of their 52 retail stores. Excludes Pro Comp Poly Systems. Offer valid through 6/30/07 while supplies last.