Ashley's Guv'nor 4cd box set for £11.26 inc delivery. I've got a couple of them already but at that price, it seemed churlish to argue...
Why do you want three copies?
I've got a couple of the individual discs (released separately) already...not the full box sets.
I guessed that's what you meant.
As to how many copies of an album you want...well, that's up to the individual.
I have, off the top of my head, eight copies of Liege And Lief - vinyl, pink island label vinyl, misc CD copies with bonus tracks, cassette (yay!), and as part of box sets.
I have twenty copies each of Dark Side Of The Moon and Wish You Were Here - one of the latter purely because it has a different shot of the burning guy on the sleeve - for much the same reasons as L&L.
I have recently bought additional copies of around 150 CDs I already have, just to play in the car.
Whatever boats your float.