The Fluid Synergy is a two man sit on top kayak made in South Africa, and sold in Australia through a couple of retailers. Quite a few were sold through ebay at a very reasonable price last year.
A 5-day family trip on Synergy's can be found here. [1]
http://www.fluidkayaks.co.za/images/Blouputs%20na%20RnS%20CK%20202%20a.jpg