[Andrew Mcveigh]

minor spoiler...
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if you want to make A LOT of money in a cheap way... build up your pickpocketing skills and go to one of the black market people in the docks district (either one of the shadow thieves guilds has a fencer). then you can sell something, then steal it, then sell it again, then steal it again, etc.
you can make a VERY large amount of money if you have the patience to do it for a long time.

By the way, i recommend saving after you successfully steal something, cause they may catch you and then you're screwed.