Our 5e Game Houserules

1. You can sleep in heavy armor a number of days equal to your Con mod with no penalty. Once you do, you must make a DC 10 Constitution save to avoid 1 level of exhaustion. The DC increases by 1 each time you make a save. A long rest at an inn or an inn equivalent removes the exhaustion and resets you back to 0 days spent in armor.

2. Trade

Spreadsheet for trade commodities and markets: HERE

Rules for trade: HERE