It would help if you said what was in the boxes and what rig its going on. I'm pretty sure you have a Cherokee, so I'll guess the box has 2 coils and U-bolts for the new leaf springs. No LCA's or trackbar?...this could be a pretty easy install. $100 for a mid-grade floor jack, $25 for jackstands, $6 for a can of PBlaster (you'll want that for the rear leaf bolts for sure). You'll also need a pretty big metric socket and open/box end wrench, I'm thinking its around 20-22mm, or the SAE almost-equivalent works for me. Spring compressors are borrowed from AutoZone for free.
How much for a shop to do it?...no idea.