You can get a refurbished 6 inch Kindle Oasis on ebay without the battery cover for about as much as any of the less fancy budget-minded e-readers cost new, and have nice features like really consistent lighting without any visible falloff, the glare-free glass screen, and other stuff like that. Just side load it with .mobi files using Calibre and Amazon doesn't make shit off of it, because they're rebuilds from trashed units showing you files from LibGen.

I bought mine here, and it's a like-new unit without any blemishes or anything.