1 cubic ft./level of any resource, for only 1500 gp cost (before reductions). Dragonomicon (page 278) stats that 1 cubic foot can contain about 12000 loosely stacked coins.
If we get those in Platinum, and assume the scroll is made at CL 15, we get 1,800,000 gp worth of PP, at the cost of 1500 gp.
That's a increase of 1200 times what you started with. The 10 ft. pole/ ladder trick only doubles your money each cycle, and the salt cow doesn't break times 5.
Further more, the Salt cow and ladder tricks can be stop be the DM saying the location your in is out of cows/ladders. With this, I can use one scroll to make the supplies in need to make hundreds of scrolls.