Whoa, I had no idea that hard drives had risen in price. When I bought a NVR16CH-16P-2AI-S2 to replace a couple NVR8CH-8P-2AI, I put two 10TB WD Purple drives in it. Each WD Purple HD was $243.99 at the time from Amazon. Just the other day I was thinking of putting the two NVR8CH-8P-2AI NVR's on eBay for about $60 each. I guess I should rethink that. The NVR's have 4TB WD Purple drives in them that I paid $74.51 for each drive. Now the drives are over $200 on Amazon. Sheesh.