So been trying to find some dinosaur or even alienish style creatures in plastic kits.
Found some options for dinosaurs
Pegagus Hobbies has some nice looking kits mostly in the US, shipping kind of kills these as an option for me, but if any one else is looking.
Tamiya used to do some kits, not bad, but lok like they are no longer made.
Lindbery kits that I can find, look kind of average.
Monogram aka revell look like they have a couple of options, seems hard to find down here.
Horizon Originals seem to have some as well, but you looking more than GW prices.
Found some resin kits on Ebay but they make GW look cheap lol, upto $2500.. yes that's not a typo, $2.5k..
As for Alien creatures, not looking for direct replacements, but Tzeech screams or Seekers of slaanesh sort of wierd looking things or same level of wierdness but much larger is also fine too