So, there are a few rules of course!
You can use IG money, OOG money and barter for items.
You may NOT sell items that are inappropriate to game. No DVDs, T.V.s, illegal items and things of that sort.
You may sell almost anything that is LARP appropriate: Hookahs, clothing, latex weapons, IG services, art commissions, teas, all sorts of things. You may also list, if you wish, food that you will be bringing to game for IG coin.
Please do not use this forum to argue about prop quality or whether the prop would be setting-appropriate. Take it to PMs or e-mails if you absolutely must voice your opinions.