Create ads on Craigslist for your items and services, 4 weeks in advance, updated weekly. Be transparent in writing the only days and times of availability.
I would stay from pickpocketing or selling dope.
Stop at the Duty Free Shop, and sell the merchandise at a markup . .
. . . And yes, This advice was posted just so I could post a video from Seinfeld.
I think having a business is the best option. I want to invest money in business promotion. Online shopping has become increasingly popular over the years that's why I decided to start an online business. I learned a lot about available options and chose to make money with Amazon. This option has many advantages, besides I found amazon seller software that helps to manage sales.