A VM would do it, but what service has unmetered traffic? Don't they all have fine print where they reserve the right to charge you if you overextend your allow

A VM would do it, but what service has unmetered traffic? Don't they all have fine print where they reserve the right to charge you if you overextend your allowance? To be clear: I want to pay for our traffic and don't want to free ride, but I want the failure mode to be "we cut you off" and not "we'll send you the bill later (possibly much later)".