Found this yesterday in store at Sainsburys Emersons Green (Bristol).
A mammoth 6CD set including all the usual cheesey 80's and 90's power ballads.
Also they had other ridiculously cheap bargains (which currently retail for between £8-11 on Amazon) including:
The Greatest Day - Take That Present The Circus Live (2CD) - £2
Seal Commitment - £2
Rolling Stones Exile on Main Street (Deluxe Edition 2CD - Includes 12 Page Booklet) - £2
The Very Best of Enya - £2
Oh and also Michael Jackson - This is It for £3 and Annie Lennox - Diva only £1 if so takes your fancy.
There were a fair few on the shelves so I'm guessing nationwide.