They do take layaway, and there's no actual limit to how long they'll let you extend it, but typically customers pay within 3 months. As was already said, you need to email Sun, and they'll tell you how to make payments.
EDIT: and omg I just looked at the time stamps. I am two days late here. -facepalm- I have been so busy, I'm not used to being unable to read everything that happens on the board every day.