As Toyrox said.....
its worth what you are prepared to pay.
How clean is it? Rust in the cab is the biggest issue, roof, floor, etc etc.
If its clean and restored it could be over $5k, if you want to pay that much.
Bits can be found on
www.bjsoffroad.com
www.zandmjeeps.com
www.familyparts.com
Also get an online subscription to jp magazine, lots of advertisers in there for NOS and reproduction jeep bits.
Of course, Wooders is also a source of knowledge and will help with parts too.