We bought the kids Echo Dot's for Christmas, so they could use the features such as music, calendar, bedtime stories, etc.. 

I'm trying to work out the best way to setup their Dot's (which will be in their bedrooms). Kids are 7 and 9. 

Option 1: Set them up as speakers on our home account. We are currently using Amazon Music for ease of use. For $13/month we can have unlimited music on all of the Echos. They would all run from my account. I can setup a Voice pin to stop any purchases. We use a family calendar so that wouldn't be a problem. 

Option 2: Set them up with their own accounts (supposed to be over 13), and join them to an Amazon Music family account. $20/month for 6 users (I could also add my niece and nephew with this option). Not sure about stopping purchases but I think we can still set up voice pins. They could have their own calendars eventually. 

At the moment Amazon Freetime isn't available in NZ, I assume it will be sometime in the near future?

Is there a free way to get music on the Echo Dot's that would work for my niece and nephew (whose parents are not tech savvy).