Add USPS First Class Mail Parcel to the shipping methods
This shipping method is now available to USPS users
they have this its called First-Class Mail - Parcel
3Dcart currently only offers "USPS First Class" as an option which is actually USPS first class letter/flat envelope. I have been shipping USPS first class parcel for years on Ebay, and would love to offer it as an alternative to priority to save customers money.