As noted these codes are off a very small list Save50, Save35, Save25
However the codes below can be used off all non agency books(lots), these are usually the ones the don't end in x.99c
Note they are generally one time use only so if you've used em before tough luck
20% off
Welcome20
anniversary20
anniversary14
save20bday
birthdaykobo
kobomay21
As noted these codes are off a very small list Save50, Save35, Save25
However the codes below can be used off all non agency books(lots), these are usually the ones the don't end in x.99c
Note they are generally one time use only so if you've used em before tough luck
20% off
Welcome20
anniversary20
anniversary14
save20bday
birthdaykobo
kobomay21
25% off
Comeback3cl23
Comeback3cl23
Comeback6sq52
kuri2
kaki2
soba2
Comeback7cr53
30% off
bhb12
dhd12
hdd12
ddc12
dcx12
cxq12
xqx12
zkz12
pzf12
zfp12
pari8
puri8
pori8
dandy4
cutie4
prety4
saku39
Comeback8_41
AprilGet30
kobo2014
STOCKUP30
Comeback4sq66
Comeback1cl42
Comeback6cr46
35% off
halfdiscount35
thanks8_6cl87
Comeback1sq42
Comeback3cl86
Comeback5cr87
More than 35% off
PERKOPOLIS (40% off, MULTI-USE, possibly CA only)
SAV50 (50% off)
list shamelessly lifted from the kobo deals thread on mobilereads
http://www.mobileread.com/forums/showthread.php?t=115233