I ordered new 3.5" Metal Cloak springs and selling the 2.5" springs currently on my JK. They won't be available for about 3 weeks. Cost new is $378.
$200 cash for GATR Core members. They'll go on several Jeep Facebook pages for $250 in a few weeks.
They've been on my JK for 50k miles and no hint of sagging. Metal Cloak rates their spring heights for fully armored Jeeps. When I put these on my Jeep when it was brand new, I got about 3.25" of lift.