I can't think of any device made today, whether it's an eink reader, an Android tablet, an iPod Touch, etc, that doesn't have at least WiFi capabilities. These days, any device without at least WiFi just wouldn't sell.
The last device I had that didn't have WiFi was my Palm III. But that wouldn't open any modern files such as epub.
If you find something, let's us know. I'd be curious to see something without WiFi. Why don't you ask your teacher what is acceptable to use?
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