they sell them in Bavaria. And in Smithfield Flowers (dot com). Here:

I'm going to start my own revolutionary party. We're going to attack evil corporations by sneaking into their head offices late at night and packing every floor with pink helium-filled balloons. Then the next morning everybody will come to work, only to find themselves unable to enter the building. They'll take a couple of balloons home for the kids, and have a nice day by the seaside. Any miserable killjoy who tries to burst all the balloons will be reduced to tears of laughter as their voice gets squeakier and squeakier before eventually giving up and going to the jolly nice little cafe round the corner for a cup of tea. Everybody will be happy and evil will be vanquished. That can't be all bad, can it?
(,
Mon 22 Oct 2001, 14:33,
archived)

I'm going to start my own revolutionary party. We're going to attack evil corporations by sneaking into their head offices late at night and packing every floor with pink helium-filled balloons. Then the next morning everybody will come to work, only to find themselves unable to enter the building. They'll take a couple of balloons home for the kids, and have a nice day by the seaside. Any miserable killjoy who tries to burst all the balloons will be reduced to tears of laughter as their voice gets squeakier and squeakier before eventually giving up and going to the jolly nice little cafe round the corner for a cup of tea. Everybody will be happy and evil will be vanquished. That can't be all bad, can it?