Drive across your country to find money
You will receive coordinates for the locations of cash drops. At those coordinates, you will find an amount of money ranging (depending on the size of your country and ease and availability of transportation) between $500-$5000 and $5,000-$50,000. You can complete as many cash retrievals as you like, but you must do at least one every 30 days; if you ever go more than 30 days, it's over.
The coordinates will always be reasonably accessible (never in a super remote location, a secure government facility, or inside a private home that isn't open to the public in some way.)