2TB for around $60 is fairly normal, but I'm not sure I'd have much faith in that 3TB $60 drive.
It may be at Newegg, but it's a Marketplace item "Sold and Shipped by goHardDrive". The drive is also only rated 2/5 there based on 21 reviews, nearly all of which are from 2011-2013, with ownership dates indicating that Newegg themselves hasn't likely sold this model in around 6 years. The most recent review, from early 2017, said that their drive came heavily scuffed, and probably wasn't new, so these may very well be 7-year old refurbished drives that weren't even all that positively received back when they were new, and if they are refurbished, $60 isn't even a particularly good price for them. Or at best, they're old stock that's been sitting around somewhere for over half a decade. Due to it being an early 3TB drive, this model also apparently uses five platters, resulting in somewhat lower performance and a higher chance of failure compared to newer drives offering the same capacity on fewer platters.
Nintendork :
6TB office 365 is the cheapest storage you can get if you got decent internet speeds.
Not really. Office 365 costs $80-$100 per year. That means, after just 5 years, you'll have spent $400-$500 on that 6TB of storage, assuming Microsoft doesn't raise prices. Hard drives, on the other hand, mostly involve just an initial investment and will usually run for many years. Even if you pick up double the capacity to allow for backups of everything, you will still likely have paid less after just several years or so.