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Bugaboo Donkey Twin
Since the NL is flooded with Bugaboos, your best chance may be to find it on Marktplaats.nl. It is easy to sign up and start bidding/calling:
http://www.marktplaats.nl/z.html?query=bugaboo+twin&categoryId=565&postc...
However since the Bugaboo twin is so new, it may be difficult to find second hand. Instead perhaps try the Easywalker:
http://www.marktplaats.nl/a/kinderen-en-baby-s/kinderwagens-en-combinati...
Or the Urban jungle:
http://www.marktplaats.nl/a/kinderen-en-baby-s/kinderwagens-en-combinati...