Pricing will pretty much be the same what ever state your in, competition competes against it's self, benefits the patients.
Vaporizing is hard core for me as I have asthma, so I prefer to smoke the buds them selves, easier on my chest and I know exactly what I'm smoking.
Just like veggies organic is better because there are less foreign entities (all though I love me some tities). Most MMJ is not organic, them nugs are hard to find and are mostly out door where the soil is old and the compost and worm poop is fresh. But grown indoor, the plant can be flushed properly. This basically means your running R O water through the root base for an extended amount of time before harvesting/cutting the plant. The only watch dog I have for that is to smoke it and personally judge the content remaining. The ash will tell you everything, as far as the carbon footprint goes. If you "smoke a bowl" you should be left with white ashes and not a bunch of nasty residue.
Phx tap water usually tests out at over 600 PPMs (Parts per million), that's why I don't even give it to my dog. R O water should be under 50 PPMs, the place that I work at gets the PPMs down to around 100, which is awesome.
Chefs are like resturaunts, find a good one or a good club and stick to it. Consistancy is everything when it comes to edibles.
If you are granted a medical card, it lasts a year and you renew each year. There are different types of cards in Az.