Upstream covers a hundred-plus themes. This site keeps developer-heavy categories:

Category	What you see on listings
AI services	Claude, ChatGPT, Gemini, Midjourney seats and quota
PC / mined hardware	GPUs, PCs, retired mining parts
Phones and tablets	Carrier-locked units, “all green” checks, battle damage
Virtual goods	Cloud-drive packs and study-material slang
Game accounts	Steam region and top-up jargon
Condition codes	Soft language for exterior and hidden defects
Trade slang	“Brother price”, “you know”, offline meetups

Full lexicon: GitHub repo. Fashion, anime merch, and other niches stay upstream.