I'm lucky as well. My 15 GT PP has 21k miles and I do not drive it nicely. Maybe due to the fact I have no interest in drag racing or clutch dumps? Seems ok. Of course I would rather have a beefier unit, but I can deal with it.
That group is all but dead. FB marketplace would be better, or Craiglist. I've dumped all my old G35 parts on CL and sold all of them. On a side note, I would also be more than glad to lend a hand. Plenty of tools (advantage of being old I guess)
I was pretty active on SVTP as well, prior to (regrettably selling my 04 Cobra). I went to a 2014 GT then my 15 GT performance pack. The new models with the A10 seem to be amazing. I'm happy with my 15, so I'll watch for now.
Take care
While he does put out great video content and works on high end cars, it seems the price of is products are also at a premium.
Here are products I use and have great results with, that are mostly easily available. The P and S Beadmaker was ordered through Amazon (gallon to make it worthwhile)...