[SixOfSpades]

What you want is a way to gain lots of money and avoid quest EXP, not EXP in general. So try to avoid the Stronghold quests: The Keep, the Sphere, the Planar Prison, Mae'Var, Unseeing Eye, etc., all of those quests grant quest EXP, which you want to save for Imoen.

Here's a radical new way of making money: Sell some equipment. Really, there's enough stuff in Irenicus's Dungeon and Waukeen's Promenade to make over 15,000 before you even start Chapter 2, and you can still keep all the really important stuff like the Helm of Balduran. Try taking out the Temple Sewers gang and sell all of their stuff that you can do without (for instance, you can use the money you earn in the Chapter 3 quests to buy back that Helm of Defense).