If you like finding it do it your way, but if you want some help, there is a "?" icon on left side of the screen, it will list out all the money places.
Note: It wont work for new places that was added in 0.3 (ie. Kombini market and minatos house), the dev only adds their hint in 0.4 (as well, if any new places added in 0.4, its hint wont work in 0.4)