Before the pandemic hit, GC was becoming a better place to sell. I was pleasantly surprised at how much they were offering for gear. Perhaps we'll get back to that in the future.
Sweetwater also has a used marketplace as an option.
Thanks for doing this. Although each amp is different, I've generally found the 60 watter IIC+'s to sound a bit sweeter. I think I hear that in your clips, too, although that might not be a good thing for a metal tone. Here for that application the hundred watt sounds better to my ears.