Seriousy, as most of the lifts are installed, the only SL's that come available typically are from when someone does a SAS.

So, you should look for SAS's 2000 - 2004 Xterra's, and offer to buy the take-off parts.

BL's are more common, as a lot of people get them, and then something happens, and they don't install them. Also, you can make your own 2" BL for ~ $100 in parts.

Good Luck!

Otherwise, just go to AC if you run out of patience.