You could try Amibay forums, but also you could just use an emulator either on a PC or modded console. I play Amiga roms on my RGH xbox console and can use various kickstart rom for booting as well from v1.2 to v3.00 . . .
That's another story, still Amibay as well as other sites including ebay or gumtree should fulfill what you're looking for. In my early days I owned an A500, A600, A1200 & A3000 Tower. You must have hell of a space to collect all retro computing & gaming stuff lol.
wow a blast from the past erm i cant remember what i did with mine may still be in the loft, had a hd in put in it too if remember right lol will have a look for you m8 if its there i am sure we can come to some arrangement i would have thought my wife would have made me sling tbh but ya never know.