The netherlands:
www.hyperformance.com : it's not really great, never got a reply of them
www.auto-extreme.com/nl/
www.streetlegalhonda.nl
www.s-g.nl : for tyres, lowering
And... if you don't want a honda specialist but a relative cheap store for common brands try
www.improve-tuning.nl
(maybe only for the dutch guys... so you can leave it out if you want)
uk
www.manhonda.com
www.fuzzyjuice.co.uk: hydraulic and pneumatic lowering
www.godfathercustoms.com : hydraulic and pneumatic suspensions
worldwide
www.carreview.com : site where you can find experiences of people with certain tuningbrands
www.turboclub.com
France
www.mulsanne.com