Ford Explorer replacement shocks

I have a 1999 Explorer Limited 75k w/ original auto adjust air ride shocks. Its a rough ride with a lot of body rock. I aske the dealer about replacing and they want to charge $250 per shock, $1200 to replace all four! Any suggestions of after market shocks or options? Thanks

http://www.strutmasters.com/catalog.php?cat=94

Here’s what I install when someone wants to convert from AIR-RIDE suspension to conventional suspension.

Tester