I want to lift my 2006 4runner 2inches least expensive

Least expensive would be rough country lift kit for 4runner. Re use all your old suspension parts. The kit is for front and back for about 170. Bucks. Google it.
 
I went with a Toytec lift but in doing my research found a lot of people are very happy with a Bilsatein 5100 setup. This YouTube video had some good info on the subject and he goes over the install as well. The video is for a 5th gen 4runner but the process is going to be very much the same on a 2006 model.

 
Bilstein 5100s are pretty good, I have it on my 03 4runner with Dobinson springs all around. So far I'm happy with the handling on the highway. Haven't gone off-road yet.