A sway bar is pretty easy to add. I picked one up from Craigslist for about $40, put on new bushings, and bolted it on.
While mine is far from undriveable with the sway bar unhooked, it does make a big difference. I wheel a few miles from home, and often leave it unhooked for the drive home because every thing is covered in mud. It does fine as long as you are careful.
I sure wouldn't drive it like that for the 200+ miles a week that I spend DD'ing it on back roads, highway speeds, zipping in and out of traffic, etc....
78 CJ7 258 TH400/Dana18 SOA/stock YJ springs 35" General Grabbers.