You indicated in the initial post that this university was chosen in part because of a significant difference in cost. What has changed since last spring to suddenly make you think it is reasonable to leave the cheap place? Where is the additional money going to come from?
Were any of last year’s admissions offers from places that would be on a transfer application list? If so, contact them and enquire about the process. Sometimes the file only needs to be “up-dated” and a full application isn’t necessary.