[ProAm]

USPS is a private entity under the government, they fund themselves. They receive no funding from the government.

You can look at the military and at obamacare/heathcare.gov for examples.

[mozumder]

You can also look at the USPS as an example, since it IS a government entity that doesn't have to serve profits.

Also, the military and healthcare is more efficient in government, but you probably already knew that already.