I belong to a live group swap that meets in Scottsdale, Arizona once a month. It's usually on the third Saturday on the month at the Frenzy Stamper in Old Town Scottsdale. You can get more information at the Frenzy Stamper blog here:
Right now we have a small group and could always use a few more. You can mail or drop off your ATCs at the shop if you can't come. The only rule is that you must bring ATCs to receive ATCs. It's a nice group and there is often a make and take. Feel free to contact me by PM or e-mail if you have questions.