The cheapest route would be to find some factory springs at a junk yard, and add some TJ coil springs aka the zuk mod. I've had a saggy '94 for years, and adding the TJ springs leveled it out perfectly. I think I paid 30 odd bucks off e-bay for the springs shipped to AK.

'94 extra-cab 3.0 extra slo (auto tranny) original owner. E/B o/s valve heads and no more crossover. More mods to come.