Reaper has some skeleton pre-paints...



Just need to mount them on some square bases.

You could also get various DDM figures:






(kind of goofy, but large based)

Some non-skels:
(One of my all-time favorites)

(Female zombie!)

(Meh)

(I don't know if this is actually undead or not ... but it rocks)

For leader types, here are some interesting (but more expensive) ones:








You'll notice those are all from the same seller (Auggie). He's the best minis seller on Ebay, IMO, and has a flat shipping cost (one price, no matter how many minis - and I've ordered 100s in a single order before). Rarely had a problem with an order, and never had a problem that he didn't solve quickly and easily.

I'm sure there are more, too. But those are the ones I could come up with off the top of my head.

I've had very good luck buying GW boxes on eBay. Got a box-o-skeletons for $25 shipped for 20. Really not a bad price. Of course, all their other undead go for astronomical amounts of money ($45+ per unit), but skellies are usually cheap. Oh, I'm a big fan of the HeroScape zombies, too. About $15 for 6 pre-paints...if you look around, you might get them for closer to $10.

Their is a newcomer to the standees market that has some GREAT skeletons as well. Big fan of his work.

Depending on how many skeletons you want, this might be for you. I just followed Kane's advice and did an ebay search... found this:



Arabin

I recently got my hands on the Zvezda cursed legion box for $A36. They are being cleared out at Johns Hobbies in Townsville. Quite a saving when you look at the original price! Is people's Soviet Games Workshop, Comrade! The necromancer figure I also have cost $A9.50, down from $A16.50, not a bad sculpt but all that money for plastic?