Yeah Merv, RMC have never been good at marketing.
Since the current owner took over few years back they have ventured into manufacturing the Westfield cars under licence:
http://www.westfield-sportscars.com.au/
So they did not have to rely on the glass cobras in what they described as a crowded market. You can still buy their kits but you have to know about them or get them thru folks like Neil Streeting in Sydney who is a cobra builder.
However, more recently they imported two Kirkham alloy cobras. I guess to put some distance between their products and all the others in the marketplace.