It's curious to me that used items in amazon Warehouse sell for very high prices...
For example, I randomly picked a 24V power supply:
https://www.amazon.co.uk/-/dp/B07P4N3H1F/
Cost: GBP 16.99, non-new + GBP 4.99 shipping.
Yet From ebay an equivilent item, inc shipping, is [1] costing GBP 4.43 (brand new). From Aliexpress the item costs GBP 4.87. On Google, there are 10+ companies all offering this device for similar prices.
There is some kind of market failure going on that is allowing Amazon to be substantially higher priced for the same items even when the item is in non-new condition.
[1]: https://www.ebay.co.uk/itm/191620564194