THere are two kayak shops. ONe is just over the border in France ( Named the Canadian kayak shop as it has a Canandian. owner) at the NOvatis side of Huningue ( close to the White water canal site)
http://pagesperso-orange.fr/infocancan/Templates/
Very friendly, helpful owner.

or: www.cancan.eu.com


THe other is on the Swiss side of the border, just the city side of Novartis. This one has a lot of secondhand boats at times, and I think they are advertising a couple of sitons at the moment http://www.globepaddler.ch/shop.html
ALso friendly , helpful staff.