Well you jeep doesn't have struts so thats going to be kind of hard. Search budget boost or BB that should give you a good idea of what you are looking at. If you want to go up 1" or more you will need new shocks as the the stock ones are not long enough.
2003 Jeep Wrangler Rubicon
4.0L, 42RLE, Dual Tops, Full Doors, JKS Front Disconnects, Cragar Soft 8 Black Wheels, 33x12.5x15 Goodyear Duratracs, .75" Front Coil Spacers, Bushwacker 6" Flat Fender Flares, Skid Row Steering Box Skid, LubeLockers, Rubicon Locker Mod, OBA, Cobra 19 Ultra III CB, 3' Firestik, Rough Country 2.2 Steering Stabilizer, RC 1.25" BL, RC 1" MML, RC Grab Handles, Fog Lamp Bent Pin Mod, 4" Apline S Series Speakers, Kenwood Excelon 6.5" Speakers, 6.5" JL Audio 6W3V3 Subwoofer (in center console) w/MTX Thunder 202 amp, IPF H4 Headlight Housing, Sliverstar H4 bulbs.
Also depends on what you plan on doing with your Jeep, and how large a tire you're wanting to go to. A 1-2" lift with 31" tires can be done pretty cheaply, but it gets more complicated the higher you go because there's more stuff involved/issues to be addressed. Like someone else mentioned, look in the TJ tech forum. Also talk to others that have lifted Jeeps. Most Jeepers are more than happy to answer your questions if you go up to them and ask them questions related to their Jeep. Is there a Jeep club in your area?
It sounds like you're new to Jeeps. Welcome! You might want to pick up an issue of JP magazine, 4WD & Sport Utility magazine (and subscribe to them), and google "Quadratec" and order a catalog - that'll get you started. Do a lot of research and ask a lot of questions before you start spending money on your Jeep. It's best if you only have to spend money once.
Since you didn't fill out your profile yet, we don't know anything about your Jeep how old your Jeep is. A budget boost is basically just a spring spacer that goes on top of your current springs. If you're running factory springs, and your Jeep is a bit older or has a lot of miles on it, you'd be putting spacers on top of possibly tired springs. A mild lift kit with new springs isn't that much more than a budget boost lift. Something to think about...