I'm in Chicago area and some prices have been back down over the past couple of months. Cresco and other similar are still going strong at 60-65 an eighth, but I've seen lower-profile growers at 40-something per eighth.
I'm expecting city prices to spike in January due to recreational consumer excitement, then eventually get cheaper than what they have been for medical card holders.
Personally, I think medical weed here is a giant ripoff. In California earlier this year you could find sixty dollar ounce specials.