I have zero affiliation with these companies, I just think the ideas are cool.

Consider enrolling MariaDB into "Flattr" to raise money. Provide a "like" on the mariadb.org homepage! https://flattr.com/

Also, consider raising money to implement one particular feature at a time by posting it on https://www.bountysource.com/ or something like it. I would suggest trying to fund one new feature a month (or quarter).