If the Bastethi are some sort of cat-people, you could search for catfolk from other manufacturers. Usually, if there is a D&D equivalent to a people/monster, someone produces it. At least Reaper produces some catfolk. However, they are not undead, less mummified.
Ammut - as crocodile-headed lions - bring to my mind some Mierce Miniatures monsters. But they also seem to be easily modified from quality toys: pick up some crocodiles and some lions, chop chop, and add a lion's mane around the seam. Again, if you need that undead vibe, my ideas probably don't work.
-Z