Unfortunately, they seem to be made in Poland, and sold only here. Here's a link to a current auction. They've changed the style of the bag a bit, but it's essentially the same thing as mine. They are, I believe, about 15 litres each--huge. ;-)

http://www.allegro.pl/item585570924_...f_idealna.html

Notice, however, that they don't clip onto the sides, but rather are held together by laps over the top of the rack, and velcro straps. It's a bit awkward to get on and off, so I generally just leave them on my bike. :-) Oh, the cost? about $30 including shipping (to Poland). So, they aren't really expensive, at all. :-)

-Jon