The Future Entrepreneurs buy anything from anyone with no questions asked at about 20% of their value, and resell both used and new goods. Used goods cost 50% of normal value but may be prone to breakage, whereas new goods cost 80% of normal value and have no such worries about quality. However, the Future Entrepreneurs inventory varies wildly from week to week.
Discount versions of magic items are available for 50% of full price, but are guaranteed to have at least one quirk that modifies their functionality. Some are simple, such as requiring the user hum while using a wand, while some are far less practical, like requiring the user to sing an opera number while sneaking… The severity of the quirk is based on a d100 roll, with higher rolls meaning higher severity.
The Future Entrepreneurs trade goods at a base price equivalent to market value, although Persuasion may edge this higher or lower.