If you really want to get into the commerce side of things and do it in a semi-roleplaying way, here's a semi-cheesy way to do it. Join an internet game where you know the prices of items (magic and otherwise) are relatively cheap (eg. Z's Escape From Undermountain module where the Yawning Inn sells Cure Serious Wounds potions for 16gp vs. 99gp in the Official Campaign
), buy up, then leave that game and join another one where you know the prices are expensive and sell there. After a while you could make a tidy profit from the spread.
But that's not why we're adventurers, right? We make money by killing things. If we wanted to make money by trading we would be merchants, or greengrocers.
[ 07-10-2002, 11:27 PM: Message edited by: Memnoch ]