Estate sale Fuselier speakers for $370 but I know nothing about them.

I’ll just say it’s on the $150 side of things. At the moment I’m looking through Craigslist and FB Marketplace at < $100 stereo receivers as a placeholder for now just to tinker with these speakers.

If you don't listen to radio, you don't need a receiver. An integrated amplifier will work just fine. What is your source? CD player, turntable, tape deck, streaming?

I'll be using a turntable in the future but for the beginning I'll definitely be focused on streaming through my laptop and I would assume an AUX.   I know you said a receiver is unnecessary, I don't listen to the radio, but any thoughts on a Denon DRA-685 for $100? There's one somewhat local to me.   

Also, update for anyone still following along. The pair with all four sides covered looks immaculate inside.

3.3's!  If the woofers are in good shape you will be rewarded with good quality amplification. A used integrated amp would likely be the most cost efficient route to take...