It is not in very good condition, but the LP of The Fire Flies recorded in triple stereo is up for auction on eBay.
Perhaps some of you are not familiar with this sound technique (also used in a Donnie & the Dell Chords LP) and which consists in that depending on the button of the sound channel is turned, for example in the central position, you can hear the vocal group sing with instrumentation, in the right position, only the vocal group is heard without instruments, and in the left position, only the instruments are heard.
It is in bad condition, but if you are interested click here;
https://www.ebay.com/itm/114613819509
Donnie & The Dell Chords Triple Stereo LP;
https://www.ebay.com/itm/303816739981