Today is the last day to submit petitions or applications to the U.S. Citizenship and Immigration Services (USCIS) to avoid the fee increase that goes into effect tomorrow.
I recommend that you send your petitions and applications using a service that provides you with a delivery receipt that confirms your name and to whom it is addressed to USCIS - such as U.S. Postal Service Priority Mail or certified mail.
If you file your applications in person, make sure the immigration officer gives you a receipt.
Keep the receipts, because it will be the proof that verifies that you sent the documents to USCIS before the date of the fee increase.