Since I've been into it, it has only showed up once! It sold for over 150 if I remember correctly. This is on my list as well. Get you wings is by fan the most I've ever paid for a q8, next to WYWH for 91 I think.
My want list is only rock and metal tapes, with a few exceptions of course, like the one by s&c (summer breeze)
The hardest ones for me to find will be the 3 UK tapes, which always sell for a shit load of money... 2 of those are pink Floyd tapes... The other one is gonna cost an arm and a leg (as close to literally as you can get with out being literal) that tape is the elusive Q8 by The Electric Light Orchestra. It's the ELO first album. Don't know any of he songs, but it's definitely a classic rock tape, and I'm sure there's some good songs on there. I think there's 152 tapes in my list, and If I add the Jeff beck tapes it'll be about 160 I think... Only 50 or so have a star (the must haves) next to them.
Sorry for the run on there.
FWIW, the ELO Quad 8 Track only showed up ONCE! JonUrban has a photo of it if Anyones interested.