If you're running out of digital storage and are on a tight budget, you could do a lot worse than consider Seagate's latest hard drive. Part of its Archive HDD line, you can pick up an 8TB model for just $260.
Other 8TB disk drives tend to sell for closer to $1,000 so this is certainly cheap. That saving is down to the way data's squeezed on to the thing: rather than relying on filling the whole thing with helium, it uses a technique called Shingled Magnetic Recording technology to fit more data on a platter.
You won't, however, have to be in a rush, especially if you're used to SSDs: it has a read speed of 150MB/s, which compares badly to modern SSDs which manages something closer to 600. Still, a little simple math shows that this drive delivers storage at a cost of just 3 cents per gigabyte which is probably enough to convince an awful lot of people.