Dunno where you from, but Cex in my experience has always been good, although finding bargains may be a lil difficult, the 5 year warranty is awesome

Swappa. Not refurb necessarily but gently used. I’ve purchased Androids and iPhones from here with good luck. They also recently added Steam Decks, so that’s cool, although the prices seem high.

Try backmarket.com if youre in the US Havent bought anything there myselft, but seems neat

Check your local e-waste repository.