I played a few rounds just for the heck of it and well, let's just say my luck is as crap as ever lol. 45% and above seems to be awfully hard to get, at least for me. Since the books I want are not promo-eligible, here are the codes for anyone who has some use for them!
45%
9MWWKY
35%
9HL7FF
9HPHUA
AEU7EZ
AEWZ7J
30%
9FY9B5
9G399E
9G3FV4
9G5DNL
ABQE44
ABQJLU
ACYFGT
ACYLE4
ACZLM2
AD3HSB