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I think I paid mine like 60€ on Prime day. Amazon usually gives big discounts on their devices on that day. If you search used you can probably even go lower.
Reading off a kindle is easier on the eyes, compared to a normal phone or tablet. You also get a builtin dictionary: long press a word and you get the definition, pretty neat. There's also a built-in translator.
They also have a very long battery life and, if you keep it in airplane mode, the battery only goes down when you use it.
I have the cheapest model, the version with ads, but since I always keep it in airplane mode the ads are stuck on Bill Gates' book. Only downside of airplane mode is that I can't use the built-in translator
I don't buy books though, it's all piracy for me.