I was under the impression that the P2 instance that we are using for the course is free. I just got an email from the billing department regarding the payments!
As far as I know, only the t2.micro is free, and it’s not even enough memor to load up the models, and has no GPU. The p2 is $0.90/hour (plus $5/month for the IP address, plus a bit for the 128GB or so of EBS that you need).
I’ve spent about $65 during the first month.
Be sure to shut down your P2 instances and not let them run – it’ll add up.