I picked up the 4 album set "A Song for Every Season" for £3.50 (unused) about 15 years ago and the book for 25p. Excellent value.
Now then, "The Copper Family Songbook", if you're in the UK, or even if you're not, I think you may be able to get a copy from:

Veteran Mail Order
44 Old Street
Haughley
STOWMARKET
Suffolk
IP14 3NX

I've had some tapes, cd's and a couple of books from them but unfortunately I've mislaid their catalogue. I'm almost positive the book was in it.

Whether they're on the net or not I don't know. Send an A5 s.a.e. for catalogue. Good luck

Mike