The Bankruptcy system allows one to pay the filing fee in installments. The Form can be found on the U.S. Courts website www.uscourts.gov  by clicking on Part I - Official Forms, Instructions, and Committee Notes. Navigate to the Application an Order to Pay Filing Fee in Installments (Form B-3A).
The filing fee must be paid in four equal installment payments. The first installment is to be paid within the 30 days, and at least half of the filing fee must be paid within 60 days of the filing of the petition. The final installment must be paid within 120 days after the filing of the petition.