Heh, this is kinda a cheap idea for the Khemri mummies, but a skeleton with some thin strips of hockey/fabric tape wrapped around them might work nicely.
A box of Skinks would work well for Lizardmen I think. Either that or look for a place that sells individual sprues... 1 or 2 Saurus sprues and 2 Skink sprues and you've got a team, plus some extras for coaches, cheerleaders and whatnot.
Amazons would be a bit tougher, but if you wanted to be really creative, either the plastic Dryads or maybe the new Daemonettes when the come out? Not really Amazons per-se, but they are female and kinda amazony-ish.
If I think of any more I'll let you know.