Suggestions pls on plane ticket..?

Ok, I'm in Honolulu n my bro is getting my plane ticket to Saipan for me. BUT, he's not gonna get it till August! I desperetly need to leave by may! can you give me suggestions on what I can do to make that possible?? for me to leave by may, at a cheap price?? can getting a credit just to pay my plane ticket be an option??