Well, the GW skeleton warriors box (5 models) has skeletons that are bare enough that I feel like getting rid of weapons wouldn't be that tough. Otherworld minis has a similar set (and another) that's a bit more expensive (and pewter) but shouldn't be bad for converting either. They also have a few sets without weapons (1, 2, 3). None of this is all that cheap unfortunately. I hope this helps, best of luck mate!