Jim, the 2G modules in your stations is the GPRSbee, made by SODAQ. You can order it directly from them on their webshop (https://shop.sodaq.com/gprsbee-rev7.html), and they ship quickly from the Netherlands. They used to be available through other vendors, but not anymore, so we buy them directly from SODAQ. It come with the antenna and power jumper wire for connecting to the spare LiPo jack on the Mayfly. Everything else you might need for building your station is in the shopping list found in the EnviroDIY sensor station manual (https://www.envirodiy.org/mayfly-sensor-station-manual/). The enclosure we include with the starter kit is the RP1095C, available from several electronics parts vendors.