If you're doing the tinting yourself, ebay has laser pre-cut tint for most vehicles including the WJ. I tinted my front windows to match the factory stuff (%20) with laser cut tint ( I think the seller I used was tint-pro (click)
). I've used the same seller to tint my last 3 cars. It's great quality and doesn't turn purple like the stuff you get at wal-mart does. And no, you don't have to take off your windows, but removing the door panels to tint the front and rear doors makes things easier.
Taken about 10 months after installation. I helped a buddy tint his truck with Wal-Mart tint and 6 months later it is starting to turn purple already!