Magic Items

Use: I'm using the PHB system where you get 1 item Daily use per day, +1 per milestone.

Sale: All items sell at base 20% list price.   Depending on item rarity, PC effort, etc it may be possible to get more.

Buy: Base purchase price is 100% list price.  Commissioning an item, where possible, typically costs 110-140% list price.

Subsistence

The Burning Hand receive enough gifts from Loudwater's grateful populace for their heroic deeds that they do not need to make routine expenditure for basic subsistence.  Beyond that, a comfortable lifestyle with private inn chamber, good wine at meal, laundered clothes, church donations etc would be ca 10gp/week, lavish expenditure/carousing would be ca 50gp.  Let me know of any expenditure as it will affect your social status, use of Streetwise/Bluff/Diplomacy, etc.