Good question, I've actually never tried searching for a website for either Preiser or Historex.
I just ran Google searches on both. The search for Presier didn't return any website belonging to Preiser--though I only looked at the first page of returns--but there are numerous links to vendors who sell Preiser's model railroad figures of various scales. In my previous post, I was thinking of the styrene kits Preiser made of SYW Prussians. I'm not sure, but I think they are out of production. They were made of styrene, if I am not mistaken, to the same detail as Tamiya's figures, or Historex' line of figure kits. I also think that they were off-scale, maybe a hair larger than 1:32, but I can't remember. They turn up at shows and on eBay every so often.
For Historex, here is thier own site:
http://www.historex.com/
all in French, however (Capitalron, a little help with the translations?
)
And here are Historex Agents UK, and this link shows the catalog page featuring the classic white-plastic figure kits:
http://www.historexagents.com/shop/hxsearchresults.php?SupplierCode=HI
Historex Agents sell a lot more than just the Historex line, though, so if you go to the main page, you can do a lot of browsing.
These really are models, military miniatures in the truest sense of the word, and I think it's accurate to say that when they were introduced, they represented the pinnacle of injection-molded figure kits.
Hope those links help!
Prosit!
Brad