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Since you are moving overseas my first choice would be a Kindle. The reasoning being that you can still access Amazon's US store by having a US address listed on your account. It need not be your address, you can use that of a friend, relative, or even a fake one.
Amazon also has lots of free books as well as daily "promo" books that are free for a limited time. Just in the past few weeks there have been 5 or 6 "tween" chapter books on free promo, including a pre-order.
All of the free sites you listed offer downloads in Kindle format. I know epub is less of a concern but you can easily convert those files to Kindle using the free software, Calibre.
Whatever reader you decide on, I'm sure your kids will be thrilled. They are a great age to start using eReaders.
--Mom of 4, Grandma of 2
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