I am Canadian and possess a medical marijuana card (Ontario). Obviously I will not cross the border with my CBD oil but when I get to Tampa, is it possible to LEGALLY get some?

No you can not purchase without Florida compassionate use card

Not from Trulieve, as you would need a Florida medical card / patient ID and prescription, but CBD is available OTC at most vape/smoke shops.

No, you need to get state card and be a resident of Fl

Yea, cbd is legal in florida