I have a new-in-box ReadyLift brand front leveling kit for 2011+ Ford F-350 and F-450 4x4 trucks. It's ReadyLift part number #66-2511. Does not work for 2wd trucks or F-250s according to ReadyLift.
More info from their website:
MSRPs for $430, seen 'em online for $380. I will sell for $300 shipped in the continental 48.
PM me or reply here if interested. Paypal works best, I've sold a couple things here before without any issues.