The cheapest way for you to get 4" of lift would be to get a 2" economy suspension lift like a Rubicon Express kit that is basically spring spacers and longer shocks. That would cost you about $200-250, then you could get a 2" or 3" body lift for another $140-150. That'll clear probably 35" tires or so, but most people on here will tell you that more than 1" of body lift looks ugly and usually puts too much stress on the body bolts if you're going to do any serious off roading. I would be one of those people (in fact, I think the only good reason for even adding a 1" body lift is for a high clearance belly pan, but I digress).
Your next option is going to be something like a Rough Country or Skyjacker "economy" 4" lift, but as mentioned previously you get what you pay for. An economy 4" lift may come with lower control arms but they almost always will be non-adjustable and will not have flex joints. If you don't add adjustable upper control arms (at least for the rear) you will not be able to install a SYE and will have to use a transfer case drop that will take away some of the clearance you get from adding the lift. Also 'economy' lifts may have a trackbar relocation bracket for the front but may ignore the rear so you could have problems there...and generally speaking most 'economy' lift kits will just come with extended sway bar links instead of disconnects.
There's more, but you get the idea. I'm not trying to tell you that you shouldn't get an economy lift kit (it would be better than a body lift), but if you do a lot of serious off roading an economy lift is going to leave you with a lot of issues that you will need to address. If you just do very occasional light wheelin' you probably would be ok.