I always like to start my research at
Tire Rack because they're pretty accurate on what size rims and tires will fit on your vehicle if you're wanting to change sizes. Just a quick search for our Limited and it looks like you can -3 to a 17" if you wanted.
Once you know the size you can research other sites as well. I also like
www.originalwheels.com especially if you're looking for a more factory look. Don't forget, Kia
Telluride wheels will also fit on a Palisade.
All just depends on what you're looking for.