What’s the best cheap tablet or e-reader for PDF files?

Thomas needs a device to read A4 PDFs of technical papers that is cheaper than a good laptopI am looking for an e-reader for technical papers. These are usually only available in fixed, non-reflowable, PDF format and sized for printing on A4 paper. They cannot be read on a typical e-reader such as a Kindle because the text is too small. I don’t need the fancy note-taking capabilities of options such as the Remarkable PDF reader. Can you recommend something that doesn’t cost as much a