Ebay - go and search on SAS Para bergan and it will bring up the sort of thing your looking for. Beware of imitations though, difference between the Para bergan and the GS one. There is also a "modern" version of the Para SAS bergan being sold by a company in Colly, one of their Airborne bergans is up on eBay somewhere. Its supposed to be the next generation of Para SAS bergan.
I'm planning on using it on a jungle trip as it is alot better in that environment than the issued PLCE one. I did have one many moons ago but i sold it to go on the piss, ahhhhhh those were the days!!!!