I'm going to guess that a lot of these products you are finding aren't available in the US. We have Zoo-Med and Exo Terra, they seem to have the US market pretty much locked up. Again the only thing I found on JBL is from a google search and it says its for humid environments and it is made from "different types of plant and soil mulch". Maybe your best bet is to try the peat if its cheap. I honestly don't know what else you could use since I am not familiar with any of the brands you have listed, I can only go by what I find online.
**you know another thought would be to create an account on bluetongueskinks.net and see if they have any advice. I don't know if anyone there is in Germany but there are quite a few members on there from Australia and may have some knowledge of substrate mixes that are available in your area**
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