sour cherries......please!

I'm dying to make some cherry pies this summer but can't find canned sour cherries here. I've seen sweet cherries, cherries in syrup, and dried cherries but that's it. I know a friend got some at a health food type shop in London (I think they were imported from Germany). Has anyone seen them in a shop or online?

 

Fide seem to do them:

See:  http://www.spluk.net/fide-products1.htm

I'm sure I've seen Fide cans/bottles/jars in the supermarkets.

You've got me singing

"'Can she bake a cherry pie, Billy Boy, Billy Boy,
Can she bake a cherry pie, charmin' Billy?'
'She can bake a cherry pie in the twinkling of an eye -
She's a young thing and cannot leave her mommie!'"

  = twinkling of an eye!

Thanks Howard, haven't seen them myself. Can I order from their web site? They appear to be for bulk ordering for shops.