For me it's the other way around: anything I might want that's of reasonable quality will take 1+ months to arrive (usually, it'll have to be constructed to order), where I'm only a couple clicks away from having the new thing the next day buying used.
I want to be clear that I'm not saying everything on Facebook Marketplace is great. Most of it is crap! You still have to be discriminating. But everybody is always unloading high-quality furniture, and, at least for now, Facebook is full of excellent deals.