Yep grab an old school radio, bring spare batteries. There is almost always 1 or 2 people who need a jump at the end because their car ran out of battery after 2 movies.
I agree with Morgan hunts answer and why would you need to get it over the internet and having Bluetooth means that it would transmit to a wireless speaker in your car or earbuds Bluetooth does not mean that it is broadcast over the air
As of now, they do not, I would guess streaming movie audio online would cause some legal issues. As mentioned above, a portable radio is cheap and effective.
Portable radio,
Nope! I went to thrift store for a portable radio since my car has Bluetooth system only.
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