Going gold, take a subscription, for a month. You get 500 Zen, extra bankslots, extra inventory, an account bank, extra Boff slots, an extra character slot and ... you keep it after ending your subscription.
It is so good that I can hardly belief it is supposed to work that way. Well, if it is, I do it also for my second account.
Oh, I am just a player, no promo man for Cryptic/PWE.