You could buy
You can buy one of the following:
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Duck island
Cost of a floating duck island, claimed as an expense by Conservative MP, Peter Viggers. for £1,645 from wikipedia
Buy all billionaires
You can buy each US-dollar billionaire one of the following items:
Shopping list
You can buy all of the following:
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200 Carl Sagan's Cosmos DVDs
Inspirational and wide-appeal science series. Thirteen episodes, each one hour long. for £11.71 from source