I'm using lightly modded SOD (XP-cap removal, SCS and subtledoctors NPC enhanced)
I noticed that Nazramu (Djinni vendor at coalition camp) buys items at a very high rate. I managed to sell items at higher rate than the cost to buy it back at 19 reputation and with Safana (20 Charisma with items).
To my knowledge, none of the mods I'm using are interfering with shop prices.
Very nice to get wands recharged "for free", though.