Coins: In the Westerlands, Silver is the preferred metal to make coins out of. Any item cost in the Player’s Handbook has “gp” replaced with “sp” (so a sword costing 10gp in ‘regular’ D&D costs 10sp in the Westerlands). Gold is rare, and incredibly valuable.
1sp = 100cp
100sp = 1gp
(There are no coins made out of electrum or platinum in the Westerlands)
Elixirs are common consumable items.
Firearms are common weapons in the Westerlands, typically made by dwarven engineers.