Here's where the rubber meets the road. Yes it is that much cheaper. I got quotes through both my UPS account and Fedex account. FedEx was the cheaper of the two at $311. That's basically 3x what usps cost ($116) for the same box. We're not talking about saving $30 here, if that was the case is pony up the extra for FedEx.
Same goes for shipping from BE to the US. So much cheaper through postal service. And pretty fast actually. My last package I sent about a month ago made it to its destination in 7 days. Wish it was the same on the orher end, Belgian customs are picky!