that sounds very reasonable to me! You have to consider that to ATTEND the college for a year (which is about the same number of credits) you'd be paying about $20,000! Also, thirty credits is a big comittment. If you're going to be working at the same time, you could expect to finish it in 2+ years...
The really sucky thing here is that it's more the exchange rate that kills you. While it's relatively easy to make that kind of money here, it's got to be all but impossible there. Sorry, but I missed that you were FROM Singapore, and not simply living there.
I would suggest that rather than waste your money taking expensive classes from the USA, you look around your own area for missions and churches that might be able to guide you in the right direction. Certification in different biblical subjects is not "by far" the main goal of most students. Either they are building a base for pastoral (or some kind of missions etc...) study, or they are simply building a base for life. There's little point to getting the actual degree.
I would look around as I said, and find a missionary group, or church organization that would be willing to tutor you through some theological books or a deep study of the Bible.
A REALLY good way to get a cheap and wonderfully deep study of the Bible is through La'bri. It's a sort of retreat where you pay a minimum for upkeep, you help do chores around the manor, and you study Christ and the Bible for a few hours each day. There are also daily discussions and different talks throughout each week. You'd have to travel overseas for a sort of biblical vacation, but it would be WELL worth your time (and money!) Check it out at
http://www.labri.com