Straus Family Creamery uses glass bottles for many products, and the farmer's market refunds a $3 deposit when they're returned. The bottle caps are plastic, and there's an address where you can send them by mail.
Sending a few bottle caps by mail probably causes more environmental pollution than sending them back (after which still even more energy needs to be spent to recycle them).
https://www.strausfamilycreamery.com/sustainable-manufacturi...