The Grey Cup was shown free on DirecTV last year too.
After seeing this pulled up the NESN web page. They are planning to show the following games as well this month:
Sat. June 19th Hamilton vs. B.C. Delayed @ 7pm.
Thur. June 24 Toronto vs. Ottawa @ 7:30pm.
Sat. June 26th Winnipeg vs. Hamilton Delayed @ 7pm.