So I found 20tb drives as low as 270 (which is what I used for my own pricing out of a hypothetical build), but if you feel lucky you can get large capacity refurb drives for a lot less than brand new (I did this recently for scratch space on my NAS). A refurb 20tb can be had as low as 200, which gets you down to 4200.

But yes - I realized my mistake in tossing off that comment offhand.

Oh sorry, I wasn't trying to bag on you. I was curious what it takes to store 1/3PB these days, and even at $15k it's surprisingly cheap.

A few days ago I bought an 18TB enterprise grade hard drive from a hardware refurbishing company for 170 bucks. I assume he can find a home for his data for around $3500 (if he chooses to not have any redundancy)