>> How much will it cost if you try to purchase just a framekit (original stem, frame, fenders, battery lamp and so on) in Paris? <<
I think that build kits - as well as 'frame kits' as you call them - are not available for sale. For every build kit that is sold, they have to scrounge more parts, which means fewer customers for future constructeur orders. I think the shop only offers full bicycles. Jan Heine knows for sure. I visited Alex Singer cycles in 2004 :
http://www.ece.ubc.ca/
but my french (and pocketbook) were too weak to ponder such questions ...
- Don Gillies
San Diego, CA