I find talking to a dispensary that I use and respect is the easiest may to make the connection. I have gone in a few times and if I like what I see it is easy to find out if they take vendor weed. I then might take them a sample of the strain I am interesting in selling and see what they think. If interested I will then bring an ounce or more depending and see if they are still interested.

I did this at first because I was afraid my grow was not up to standard. It can be difficult to be objective about your own stuff. I tend to be very critical of all aspects. It has worked for me but this is far from an income for me, it just off sets my expenses somewhat.