The easiest way to maintain EA every month is to set up a TripleClicks Standing Order worth 1500 Sales VersaPoints. Typically, this means a 125-pack of T-Credits, but there are many more ways to come up with that 1500VP Standing Order, depending on what you might want to buy.
Of course, there are more interesting ways to do it, and less expensive ones, but it's up to you. You said "easy."