Was searching around for an answer to this, then found the solution with help of GoDaddy support:
1) Go to: https://account.godaddy.com/billing
2) Click on the checkbox of all the domains you want to know the price details for. You may "select all"
3) Click on "Renew Now" button. This will create a cart with all of the domains
Bonus: You may then also adjust year duration for the renewal, to get an idea of how much a break multi-year registrations can offer.
Thanks for sharing @JoshRizzo. That's a great solution! I'm sure it will be helpful to others!