Hello,
I understand that selling isn't allowed on this forum, but are there any other websites around where I can advertise the availability of my 3 Cross albums on eBay?
You can certainly link to your auctions. I don't think it's forbidden and a lot of people do it.
People may give you a hard time if you try to sell bootlegs or material that you downloaded from the Internet. I know I would. But I don't really see a problem with a fan wanting to sell a Queen collectible to another fan.
Do you have Blue Rock on vinyl? That's the one I'm missing, by the way.