Okios, I'm pretty sure Demonia only use pleather in their boots. I know for a fact mine are plastic fantastics! Any way, There are a few places that stock Demonias, I think they are listed in the shopping post. Any way, there is a place in Kingsgate mall(Scalies, I think) that has a pretty big range of Demonias.
Nope, almost every male boot I've seen is cow unfortunately. When to Hypatia today actually, the girl working didn't really know what was leather or not but she was still pretty helpful. Looking over the website and cross referencing I couldn't find anything without cow :(
From my understanding the girl styles are often non-cow.