Basically what was already said.
Because no user data is stored on the GH side, there is no way to automatically send an email with GHcloud itself (the system has no idea what your email is, or the email of who is purchasing) and you have to use tricks with RSS feeds.
IFTTT is an app (I have it on my phone) that does things based on other things happening with if statements (if thing 1 happens, do thing 2, etc).
I had it set so whenever GHX is listed on the exchange to send me a notification.
Eventually I turned it off