While they might not charge you directly as a line item, you still get charged: Linode in the above list is what I use. I get a fixed cap of bandwidth each month. Anything beyond that is charged. So, you don't get charged IF you stay below the initial cap.
If anything you could say that AWS is the closest to actually having unlimited bandwidth (or at least, half-parity there) since they don't charge you for incoming data, where other VPS charge you for data both ways.
Really which has more or less expensive bandwidth comes down to the shape of your data usage.