Lots of seats bolt in fairly easily some are more work
You can go for something completely different, the 60/40 Ford Ranger and S-10 pickup seat are almost a bolt in if you remove the center console (cool for a family DD), Grand Cherokee seats aren't too difficult, early Mustang seats (lots of Ford seats fit easily), Honda Prelude, Neon SRT, Jetta, some smaller Mercedes-Benz, only limited by seat width
Bolt-ins: Later model TJ seats of course along with the 1995-2003 Pontiac Sunfire, 1999-2001 Sunbird, Chevy Cavalier (all 2-door only) and the 1996-97 Olds Achieva and 1995-2001 Grand Am.
I may be the odd man out here but I really like the fit of my 2000 TJ seats. I prefer them so much more than the seats in my wife's Explorer. I actually thought about finding a set for my CJ7 project jeep.
if we goto the newer style TJ seats, do our brackets work with them? there are 05 TJ seats on eBay a lot but they dont usually come with seat tracks. I got the newer style of seats locally for $175! What a deal!! I now have to do seat risers since these seats sit 1.5" lower (so they claim) I can feel that they do sit lower.
You can also bolt in leather ZJ seats. You have to drop the brackets but the tj brackets bolt right up. Just make sure you set the seat lumbar and back how you like it otherwise you will be hot wiring it lol also you can wire up the heater and have heated seats!