I am seriously contemplating getting a couple of packs of the Mantic Games plastic zombies. Each pack allows the buyer to make 30 zombies - but I think this includes the leg less ones (which is ok by me) and the ones without a torso (not so ok by me).
A Comment on the product page of the zombies on the Mantic games web site say "As an added bonus it lookss likein stead of 30 zombies, there are infact enough parts to make 40 from each set - false advertising at its best!"
If this is the case, them 60 - 80 zombies should be enough for my game... I hope.
On some forums people have "complained" that the zombies are wearing tattered rags for clothing, thus making them useless for modern zombie games, but I don't see a problem with it - these zombies could be ones that have been rotting in graves six feet under, or they have been catching their clothes on sharp objects as they shamble around.
I can always flesh out these zombies with more modern ones to add a bit of character.
Edit - I have ordered two packs from Wayland Games in the UK, so given a few weeks, my zombie hoards should start to rise in number.