The early termination fee starts out at $175. Then it should go down five dollars a month every month after you activate service. Keep in mind that if you're on a family plan that it will cost $175 per line.
Verizon has a variable ETF which is $175 minus $5 for every month you complete in your contract. For a 2 year contract the least you could pay is $60, and that's if you finish 23 months, which in your case would be in October. If your contract is up in November and you were to cancel now you would pay $85.