Both directions in one list, grouped by direction and dearest first
within each. direction is npc_sells when the player hands over
price and npc_buys when the player is paid it; player_pays says the
same thing as a boolean, next to the number it applies to.

price is in units of currency, which is the gold coin on all but 202
offers in the wiki's data — the rest run from Silver Raid Tokens to a
Royal Helmet. Rashid alone buys 197 different items, so the list pages.