On a recent flight, I noticed they were asking $10/hr on my laptop but $6/hr on my phone, but they allow you to switch devices (as long as you only use one at a time) so I just bought it on the phone and used it on the laptop (you could also change your headers instead but I think that's technically "hacking"). It was also 3 hours for the price of 2, so it worked out as $12 for 3 hours which seemed almost reasonable.