Pinhead,
Have got them at most of the major boating dealers. Northside Marine etc. You can also consider the RAM Mount range as well - these are available via Johnny Appleseed stores.
The other approach is to get them from the USA from Hook 1 Kayak Gear www.kayakfishinggear.com A few of us have been getting the Scotty gear from them for a few years. Range is great and prices are very good if you get a bit of it, the freight is good too. Karen and the team provide a good service.
Pete