Can you purchase without having a medical, as long as you are over 21 with state ID or License?

yes

You will be able to Jan 1, 2018. BUT Oakland/California law requires dispensaries to TRIPLE tax non-medical cannabis purchases. You will pay a 10% city tax, 9.25% sales tax, and a 15% excise tax on every item. My advice, GET A CARD!!!!

No

So having a card, it is less expensive for medical reasons?

Was told they are remaining medical only. But money talks so who can say...

After the New Year, Yes.

I'm not sure but you can csll and ask