If you're wondering who's buying and selling ZEV credits, here's the California score-card for Oct 2015 through August 1, 2016. No prices:

https://www.arb.ca.gov/msprog/zevprog/zevcredits/2015zevcred...

Tesla provides 80+% of the ZEV credits transferred, and the 2 biggest buyers are Fiat and Ford. It could be that this quarter's transfers aren't in this table.