A car head unit with a built in amp for four speakers will play the speakers. You will need 12vdc power supply with adequate wattage to power up the headunit. You would also need an amp for the woofer since most HTS have the sub amp in the main unit. It would not play the center speaker.
If you can find an old surround sound receiver (pre digital or HDMI) that would drive the 5 speakers. You would still need an additional amp for the sub. Check out thrift shops and Craigslist.
Yes the speakers only is all I have. Subwoofer centre and 4 speakers. And stereo only is all that I want. It's strictly for music in my garage. Basically all i want is something to connect the speakers to that has am/fm capability for cheap.
Edit: Could I also use an old car head unit to power these without an amplifier?