When you talked shackles, I'm thinking you have a YJ. For a budget, look at your local craigslist and 4wd clubs. Your local CL will have lots of parts people are wanting to get rid of. They usually are not members or associated to any 4wd clubs so they sell their stuff that way. Those associated or are members of a 4wd club will look to sell by word of mouth or the club's website. The prices there are usually cheaper as they would prefer to sell quickly. Most of the time as well, they will have a reputation within the group so keeping repor (sp?) is a concern for them. Those on CL can be dealt with as a 1 on 1.
For adding taller tires, I wouldn't go bigger than 2 sizes than stock. This will maintain a performance level without having a great il-effect on acceleration. Adding a slight body lift will gain tire clearance but it won't do a whole lot for the low belly you have. Lifting the frame from the axles will provide some clearance under the skid plate. Increasing tire size lifts the axles and the rest of the vehicle half the difference. Typically, it is the same for adding longer shackles. Without adding a body lift, you can gain tire clearance by using TJ flares. The TJ flare opening is larger than the YJ.
So on a budget, you could get a set of flares for near/under $50. Body lift will be near $110. (Also, the shifter bell crank will need to be adjusted with the body lift. It mounts between the trans and the floor brackets.) You could get the longer shackles used, but I don't know about costs for these.
As for tires on a budget, used set with the wheels is best, but again, if you stick with your stock rims, taller 30x9.5s shouldn't be a problem. With the 30s, the spare should fit right in the spare location.
If you wheel, you will require other items as well. Retraction/recovery capability (winch, frame-mounted hooks, straps), cb, first aid, camera. If you mind a little body dent, then you'll also need some panel skids to protect the body somehow. But all this depends on your budget, concerns, and terrain.