For me 'special event' shows have been a godsend. It take varying degrees of work and signup expense. As an example, I just finished a show in my town that cost me only $30 for my booth show space ( 10'x10') and it was very profitable. Last year I did a show in Denton, Texas that cost me about $350 and did make money but not enough to do that show again. When you show in local or even distant festivals and art shows, you put your art before many new interested people... all potential buyers. It's a two-fer.... make mone and gain powerful exposure. Secondly, placing your art in high-traffic galleries is very good. I have sold in New Orleans French Quarter.... providing a constantly fresh audience for my fine art and limited edition prints. Thirdly the online exposure is good too. I have a website and have exposure through websites like Pinterest. Now on the first suggestion (festivals & Shows) , it takes time to search & evaluate shows, physical work to actually do the show, and the cost of a tent-walls-chair-table-etc... plus the booth fee and travel costs. But the payoff can be immediate.