#3 - Aug. 6, 2010, 11:52 p.m.
You should't be able to, Applesaucee. If the characters are on the same account you will not be able to make the purchase. The purchase would need to be done by a character on an alternate account. It can be from the same Battle.net account but not the same World of Warcraft account.
Moving gold in this way is not considered a violation of our Terms of Use, though neither is it supported. If something goes wrong our staff will likely not be able to help.