Free will is an idea permeating our culture and law system and as such deserves a little bit of investigation. It is easy to believe in free will if one sees themselves as a completely isolated and independent entity. But consider this:
Each of us has personal history, starting who knows when and ending about a second ago. All this input, education, trauma, abilities, knowledge etc., influence what we want and do. If someone never saw an ad for the iphone or the device itself, they would never want one. They would never "free will" to spend the effort necessary to buy it.
Could "free will" be influenced by personal history?
Consider the state of the body-mind organism: In the morning one is fresh, in the evening, one might be tired. In the morning one may agree to attend a late party, but at night, she may be too tired and cancel. Could free will be influenced by the needs and state of the body and psyche?
Consider circumstances: The free will outlook sees the world as strings of limited number of causes and effects -- "If I catch the 1pm flight with connection in Colorado, I will be at my destination on time for the interview with an hour to spare..." The connecting flight gets cancelled, the interview meeting follows suit. While the world around us is pretty reliable, it is never 100% reliable; even scientific experiments include a margin of error.
Could it be that the results of the "free will" intentions vary based on circumstances?
Choices are often seen as a symptom of free will, and free will is often seen as some kind of independent force, rooted in oneself. I suggest exploring the moment of choice and seeing if it is possible to locate such any force which is independent of everything else.
"I choose to get a glass of water." -- is this independent of bodily needs/thirst?
"I choose to get a job in SF." -- is this independent of the needs for success, adventure & learning, the need to matter and curiosity?
I am still to meet or experience this free will everyone is talking about.