I'm a cheap *******. I also have a 12 hour drive ahead of me this weekend as I return to school. My 16 year old car still has it's original stereo, which you probably already guess has a tape deck only. I've never been motivated to replace it with a modern CD player (dare I say mp3 cd player?!) because I usually listen to the classic rock radio station and NPR. Obviously my station presets will be useless away from home.
What I'd like is to be able to listen to my music collection on the cheap. I don't want to buy a new stereo when my old one works fine, so that option is off the table entirely. The other reason it's off the table is that the majority of my music is in .flac format, meaning the majority of portable listening devices/car stereos will not support it. So I'm thinking I'd just buy a ~150W inverter (12vDC in and 120vAC out), plug my laptop into it, and get one of those tape-to-headphone jack adapters.
First, does this seem like a bad idea? Second, is this the cheapest possible way to allow me to play my music with my vehicle's speakers?