Here are some promo codes (US only, sorry!):
FLF9NYXYYPX6
X4HKFEH74XYK
J4RFW9PPF974
HY4NRN3EHA6K
7JYK6A4TTPFA
R94FNX47YEN9
R6PTHJEHHM69
PFWKPHWRX9LT
6XR63PL4FEWR
FR9N6E6NWKEP
FLF9NYXYYPX6
X4HKFEH74XYK
J4RFW9PPF974
HY4NRN3EHA6K
7JYK6A4TTPFA
R94FNX47YEN9
R6PTHJEHHM69
PFWKPHWRX9LT
6XR63PL4FEWR
FR9N6E6NWKEP
(It took me 6 tries to find one that wasn't used, it's good to leave a note with the one you used)