I spend a lot of time in belgium and holland and while there are a lot of c&v bikes there they are almost exclusively town bikes/"dutch" bikes. Most of the racers you see are being ridden by old guys that have obviously had them since they were bought new. Having said this, I have occasionally seen nice older bikes (not necessarily lightweight beauties) in markets in Brussels and Anderlecht for very reasonable prices. These, however, are almost certainly stolen.