As Rick said, I got mine on the way back from Pre Quals last year. Can't remember where though?
They were basically 1 Euro per metre. I got 2 x 6Metre ones, one for each end of the Gazebos.
They are quite thin at the top end though so can bend in even slightly high winds.
That said, if your current pole is 10 metres (33 feet) it is probably one of the tallest anyway. And if it is a proper flag pole then I guess the old Quality v Quantity arguement could apply!