Selling Items

https://rpg.stackexchange.com/questions/87858/how-to-handle-buying-selling-prices-from-merchants https://rpg.stackexchange.com/questions/77628/can-i-sell-starting-gear-in-adventurers-league-play

https://www.dndbeyond.com/sources/xgte/downtime-revisited#SellingaMagicItem

Selling a Magic Item

https://www.reddit.com/r/AdventurersLeague/comments/8dbhi6/selling_items_between_adventures/

PHB says you can sell items for half their value. Yes, you can sell common healing potions.