I decided to create an app that sends notification every time your wallet has new operations. Stellar Watcher doesn't require lumen transfers to work; just add your e-mail and wallet's public address and you're done!
If you have concerns about your privacy: Both your e-mail and wallet public key are stored encrypted on the database. And if you're still worried, here's a simple solution: create a e-mail account on GMail and forward every message from firstname.lastname@example.org to your real e-mail address. Simple as that!
What do you think?