I’ve not heard of any dice trading groups, but it seems like an intriguing idea! Personally I prefer to only have full sets, so I’d be trading set for set (or finally palming off all my set-less dice…) if I were to do it! It’s an intriguing concept. I’ve got a biggol collection myself, over 200 (that’s where I gave up on counting because I got tired… I’d hazard a guess that there’s at least 50 more) individual dice, I’ll post pics sometime!
Also this looks like a fantastic haul Nimueh! I love the blue ones and the metal ones… those shimmery turquoise boys are fantastic too, and the purple d6s!