I believe you can get an Earthmate directly from Sendero Group. Their
phone number is 1-888-757-6810. They used to carry it, but since the
new upgrade came out, they may just be carrying the Blue Logger
receiver. Some features of the Earthmate you'll find helpful is it has
a rechargable battery, which can be charged just by plugging it in the
wall, and you don't need to set it up at all. Just turn on the
receiver and your Braille Note and you're ready to go.
Matt Roberts