UPS & USPS Shipping for WCFM

Hello!
I need to find a plugin(s) that will allow my vendors to connect their USPS and UPS accounts to their store, calculate real-time shipping rates, and (hopefully) print their labels. Of course it has to work with the multi-vendor checkout option.

WCFM has a solution for UPS, but not USPS, which is essential in the United States. They also have “multi-carrier” and “multi-shipping” plugins that together with yet another plugin for UPS (it never ends with them with the plugins) but these do noting more than calculate the shipping and you have to email labels to your vendors (no idea who pays for them), so it is unclear as to why 3 additional plugins are needed to do this just for UPS except to extract more $$$ from you. They mention USPS as a selling point that the for the first 2 plugin combo, but then later in their description it says the plugin is only for UPS and FedEx, so who knows. If you ask questions to clarify the USPS issue they push a 3rd party service, which is what I am trying to avoid.

The 3rd party service option is not a good choice for me right now because I cannot commit to a monthly charge at least not until I get a vendor or two, and it’s really not a cost effective solution for any small business, really.

I am regretting the WCFM choice, but I’m too far down the rabbit hole to turn back. They claim that the main plugin works with other Woocommerce compatible plugins.

I am hoping that there is a plugin out there that I am not aware of or that there is some way to tweak the code to make this happen.