firstly, mites at the expos are inevitable. With thousands of people walking around, 100% SOMEONE brings home a mite.
When I get home, I dump all my clothing directly into the washing machine and then straight into the shower. All my animals, no matter who I get them from, spent their first 30 days on substrate that has been treated with Provent-a-mite.
QT and mite treatment is the first step of responsible herp ownership INHO.