Yup, there is campag, and not campagI thought there was two different styles of campag splines ?
As far as I know you can't get campy cogs that are suitable for single speed said:You can purchase after market Campy sprockets singly, the 9 speed ones are steel and look up to the job. Miche brand are the most common, they are available here in quite a few shops, Greengrocer in Goulburn was the last place I saw a rack full. Getting spacers will be a bigger problem I'd say if you want to run SS. If you need a full cluster then they also make Campy clusters with Shimano splines and vice versa. The difference in spacing is that Campy put the tenth sprocket over the inner flange, Shimano tighten up the spacing of the cluster. A good quality Shimano 9 speed chain like a Dura Ace will work nicely on a 10 speed Campy cluster.