Purse Blind (3.5e Flaw)
From D&D Wiki
You're bad with money and trade.
Effect: Your character suffers a -6 penalty on appraisal skill checks, and -3 on sense motive skill checks when bartering to buy or sell and item.
Roleplaying Ideas: Characters who grew up without many companions or who grew up in the wild may have this flaw. Barbarians also might be affected.