These are all currently some of the top indoor cultivators and vendors for CBD flower in the United States.
Clutch City Farms (Restock on the 17th)
Flow Gardens (Personal current favorite) (many here are Type II)
Beleafer
Preston Hemp Co. (also High THCa available)
Five Leaf Wellness
Holy...
Yes, lots of people mix their own. The possibilities are endless. I prefer a mixed ratio bowl to any single cannabinoid. Some prefer to match terpenes and flavors, others mix based on cannabinoid percentages, some both. Its' really a subjective topic, and whatever works best for you may not work...