ECS tuning has them, but they are the Le Mans version, not the iS version like J.Belknap's.
Difference is at the rear bumper piece.
ETA: Here is Twinpoppa's
thread listing everything you need to fit flares on your X. Pick which set will fit your truck and take the list to your dealer, or search by part number on-line.
Also, there are fiberglass knock offs on ebay if you want to go that route.