Zero-G, never stop amazing me.
I got an email requesting I leave a review for Zero-G, promising a coupon if I did. I left a review, got my coupon (15% off), and tested it on Sonika (the only ZG Vocaloid I don't have) - it knocks her price down $9, from $60 to $51. The coupon expires in two and a half months, soooooo if ZG has another site-wide sale, and I can still apply that code...
My God, I love these people.