There's a pit full of skeletons under the mage's college. Not sure if they are the type you are looking for or not. But given they are laying about, quite dead, I suspect they might be.
Tried 'em, there are a lot of bones there but none are intact. Two that attack you but they shatter on death.
I remember there being a room right before the fight with Potema that was littered with bodies. I've always wondered if I would use the standing stone that raises undead in that room what would happen.
I checked that room just now and it is full of Dragur, only four of whom can be revived.
What about Shroud Hearth Barrow north-east of Ivarstead? IIRC, that dungeon has one room with eight to ten skeletons. There is/was a pool of oil that covers most of the floor of that room.
I only found a few live skeletons there but they all also broke on death.
I'm up to 13 resurrect-able skeletons so far in my legion.