Sorta
Well, you could use car speakers and build an enclosure around 'em, but enclosures are (should be) carefully designed to fit the speaker and the room they will be playing into, otherwise they will not sound good. IOW, you can't just slap 'em into just any box and expect decent sound. And, enclosures designed for the car are jut that ...designed for the car's fairly small environment, not a room.
As for the electronics, by the time you procure a 12 converter beefy enough to power them, you will have spent more than had you simply purchased a home unit, and the home unit will sound better and have more of the features you would probably want in a home unit.
...you don't have to spend a fortune to get decent home sound anymore.
As for where to get this stuff, where do you live? (US, Canada, Europe, Big City, Sticks, that kinda stuff