I recieved a limited edition interview picture disc which was made in England. The cover is blue with a big circle picture of him singing into a mic. Does anyone know how many of these were made? How many of these picture discs does he have? Thanks!

The interviews have been released periodically over the years.

It's simply people who have acquired rights over the spoken word recordings recycling the material to garner further income.

The recordings are invariably released in some form of limited run, often in picture disc format to attract interest and buyers.

The interviews themselves are not rare, and the releases (beyond the presence of his voice on the recording) have no involvement with Prince, so despite their format and limited run availability, they don't command much collector interest, and don't tend to appreciate in value.
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[Edited 1/8/05 13:30pm]