can i add a super charger to a 3.0 if so where do i get one?

I would look into turbo chargers for a small v6 engine.

how expensive is that? is it alot of work?

If you can find a kit for this engine, it shouldn't be to hard. Price can range. I have seen turbo kits around 3000 up 9000. For my mustang it is 5000 for single, and 9000 for twin. If you have to come up with something on your own, I have no idea how hard it would be.

I also read something about an x-charger. It looks like a supercharger but supposedly you don't need to do any ECU upgrades, but I only saw it so far for 4.0 ltr. Google to find out more.

i got a shop that will put a turbo on for 2200 for me on my truck but i think that it will make it blow up

yea i would love a turbo on my 3.0, but with 117k i think my motor wouldn't like it all that much lol.