Alanz said:
I tend to buy any that i find in Second Hand book shops even if i've already got them
I've done that, but lately I've run out of people to lend them to, so now I usually leave them so someone else can get a good buy. Sometimes I still get them if it's a rescue situation, as in I suspect they'll be dumped if not bought soon.
I just bought an odd one (for $1.06): a mass-market-paperback-sized hardback of the US HarperCollins edition of Men at Arms, with the HarperCollins cover so it's not a rebinding, marked as the 12th printing so they shouldn't be rare, yet I've never seen one before.