Spotted this in the Bamber Bridge Sainsburys store this morning. Loads left on a shelf on an aisle end and also some in the actual toy section with other Bing stuff on offer. This was reduced from £15 to £9 (i think) and then again to £6. It's currently £11.98 on Amazon, showing as not available on the Sainsburys website so instore only, worth a check if your kid is into Bing.
And before anyone asks, no I don't know what Flop is.