Many users find that the extreme longevity of these devices makes buying used a low-risk way to save money.
“I've purchased 4 kindles from ebay recently... All were less than $30 and all work great.” Reddit · r/kindle · 2 years ago
For those willing to buy pre-owned, eBay has listings for older generations starting as low as $20–$39 . Sites like Unclaimed Baggage also sell functional, tested units (e.g., a Fire HD 10 Go to product viewer dialog for this item. for ~$53).