Have you looked at the Asset Store?  There's an MMA pack currently for $45 if that's not over your budget.

https://www.assetstore.unity3d.com/en/#!/content/18470

Also check out the 3D Model\Character\Humanoids section.  There's a bunch of free models, but most don't have animations.  But they're all mecanim compatible, so not a problem adding your own animations to them.

Oh, sorry.  I forgot to mention last time.  If you grab the MMA pack (which I recommend for it's high quality animations), then you'll still need models.  There are a few free human models packs from the same guys:

https://www.assetstore.unity3d.com/en/#!/content/127

https://www.assetstore.unity3d.com/en/#!/content/124

https://www.assetstore.unity3d.com/en/#!/content/122

The MMA animations will work with any models that are mecanim compatible, so all the above should work.

That bikers gang pack looks OK and does come in many formats.  But there's no way to confirm if it's mecanim compatible or not.  If it's not compatible, you're potentially wasting money on animations you can't use. 

Mecanim isn't the only way to have animations of course, as UFE does support legacy animation system.

The pack will "work", but that depends on what you mean by "will it work".  Any 3D model with any animation/rig system will work.  But if it's not mecanim compatible, then it won't offer you the nice mecanim features (easily share animations between models, get animations from mixamo store, visual blend trees for custom animations etc).

The Unity docs say less than 30 bones per character with 300 - 1500 polygon count per mesh.

http://docs.unity3d.com/Manual/Modeling … cters.html

I think if you're doing a fighting game, you can get away with more of each as long as your backgrounds don't have any bones (or very minimal).  Also, I think those figures are a few years old now so current gen can probably run a bit more.

I thought I read once that for Unity Mobile there was an actual max limit of bones per mesh (something like 55 I think), but I could just be remembering something else entirely so don't quote me on that.

Anyway, the best thing you can do is just test it yourself.  I know I've gotten more than 30 bones on a mesh with a simple rag doll test for mobile before, so you should be right.