Not quite what you were looking for, but;
New Money Trick found.
Maybe as far as realism goes, you could drop items off at a shop to be sold on consignment? They could be 'sold' over time (based on the value of the items and the merchant's inventory, and how fast the merchant's inventory replenishes), minus a commission (ie you would get 90% of the value, but would not have to run around to different merchants selling stuff).
