How do i know which college will be cheapest?

The financial aid award might not come in a letter, look in your UGA student portal to see if it’s there.

Even when the FA award arrives, these are still estimates as far as tuition and fees, room and board rates might be based on 2016/17 numbers, if the school has not determined their new rates for 2017/18 year yet.

Also sometimes tuition gets charged by credits taken, so that won’t be finalized until you register for classes.
Some courses charge extra fees too. You won’t see them until you register for classes.

Final room and board charges will depend on meal plan chosen, and the exact room you are assigned to.

But you will have a starting point. Current tuition, fees, room and board charges, minus scholarships and grants.

Then you will have a net cost that you can compare.

You can take a $5,500 loan to cover part of that, ask parents how much they can contribute from savings and earnings, and you can earn some money in the summer working.