Berelach wrote:

It's a nice edition, but not rare in any sense. Even first printings are common. I've ordered several for less than £10 each from some of those big warehouse type sellers, and almost every time they're firsts. Not trying to disappoint you, I just wouldn't want anyone to go through this thread thinking these editions are worth big money. They are not.

The Silmarillion on the other hand is more difficult to find in a first impression. They're out there though.