#4 - Feb. 15, 2010, 5:31 p.m.
While pre-paid gift cards are not necessarily a supported method of payment, they are normally accepted if the proper requirements are met.
As a few players have mentioned, there will often be a temporary $1 charge placed on the card in addition to the full charge for the transfer; therefore, you may encounter an issue if you have exactly $25 available on the card.
Additionally, if there is any way to register that card via a phone number or website I suggest you do that prior to attempting the transaction.