Apple was out of stock so I found a used one on eBay for $60 including shipping. seller guaranteed it worked. Thanks to a couple of really good YouTube videos, I was able to reset it to factory defaults and then go through the set up process to connect it as an extension of my existing network. I plugged it into my preamp using a 3.5 to RCA plug, went to iTunes and chose Airport Express as additional speakers and viola, I can play my entire iTunes library through my outdoor speaker system.
Many thanks to srb for your help.
Stay safe everyone!
Laura