Fans were surprised to see the star of National Treasure and Captain Corelli's Mandolin looking for bargains in Glastonbury, Somerset.
He left the Glastonbury Discount Centre with three collapsible camping chairs for under £15 and two plastic water pistols retailing at just £3.99.
Cage owns nearby Midford Castle, which he bought last year for £5 million and shares with his third wife, Alice. The 18th century gothic pile is the latest addition to his global property portfolio, which includes homes in Los Angeles and the Bahamas.