I'm on an email list thats based in South Africa. see overland.co.za. They take having a cold  very seriously :-)
National Luna is a brand down there that is well liked and trusted, and they have been leading the way in the development somewhat from what I can gather, and now the likes of Engel and that have copied or used similiar technologies.
I would imagine it would be cheaper to buy directly from nationalluna.com (phone, don't bother with email) if you were interested. They also do a very snazzy battery magament system. loads of bells and bits for £90.
Hope that helps?
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