Not sure if its just flat rate or all but here is the new pricing for USPS on Jan 22nd
New domestic retail pricing for Priority Mail Flat Rate products include:
- Small box — $5.35
- Medium box — $11.35
- Large box — $15.45
- Large APO/FPO/DPO box — $13.45
- Regular envelope — $5.15
- Legal-size and Padded envelope — $5.30

