What about an iPad? Interfaces better than non-Apple options with your desktop Mac, won't get slowed down by modern technology like an old white Macbook, avoids conversions, and is large enough so that it is comfortable to use for reading (Kindle app or iBook) and watching YouTube. Refurbished iPads should be quite affordable and come with the Apple warranty, although newer ones may be in your price range.
On a Mac since 1984.
Currently: 24" M1 iMac, M2 Pro Mac mini with 27" BenQ monitor, M2 Macbook Air, MacOS 14.x; iPhones, iPods (yes, still) and iPads.
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