I had this done at a dealer that has good prices generally for $140 out the door w/ $10 off service coupon. I'm only at 60k miles but I want to keep this car a long time so was being proactive. They said the oil looked really clean. 10 quarts on the invoice. Also it's apparently more complicated than the regular hybrid, they hadn't done many if any Energi's yet. Another dealer quoted as high as $280! No flush, just a drain and fill as recommended by Ford, which I think makes sense if you do it early enough.
150k that the manual recommends seems way too long to wait, but who knows. I tend to think the interval is extended to lower the "5 year cost of ownership" price that you often see for comparison shopping on new cars.