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As has been mentioned, pretty much every ereader allows some sort of sideloading. I can't think of any dedicated unit that is 100% tied to only one store. I have a Kindle and I get mobi ebooks from a variety of sources.
We can give you more specific information if you tell us what types of ebooks you currently have (the file extension) and where you purchased them from. That way we can figure out what the most compatible option is for your existing files.
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