You’re presently allowed to buy and grow 4 plants without a license. A license to grow more can be had by anyone for $$. Pricing varies, depending on the service you pay to get you setup. I paid $400 for mine and have a license for 50. Clearly, it’s all about the children.
Grow shops are popping up everywhere and the new LED lights are amazing. Full grow kits can run you quite a bit but they pay for themselves in short order!