There is a 10 codes (either Type A or Type B) per month limit on each paypal or credit card account; you will be able to buy 10 codes at 1st of every month. For example, if you bought 10 codes at 1/31, and you will be able to buy 10 more next day because it is starting of next month 2/1.
However, this limitation does NOT apply when you using the following methods:
A) By wire transfer
B) By direct deposit into our Bank of America Account
C) By check or money order
D) By Western Union