The shark cards are super expensive and I was thinking maybe there're some other ways of making fast cash in GTA online. Share your thoughts.

Yes. And pretty much no one buys shark cards there. There're no reproductions for using third-party services, and there're no reasons to avoid using them. It may be troublsem to find reliable ones. Here's the link for you [url=https://gtaboosting.net/gta-5-money-drop/]https://gtaboosting.net/gta-5-money-drop/[/url] . Check all the information there.