Sometimes, plans are sold through financial advisors, but most are sold directly by states — every state (except Wyoming); and the District of Columbia offers at least one 529 College Savings Plan. You may contribute to multiple plans.
The advantage of direct-sold plans is that they have no broker fees and, as a result, are often recommended as a better consumer option!
While SoFi does not currently offer a 529 savings plan, we may refer you to options through this 529 College Savings Plan Selection Tool (to access you will need to have a SoFi account).