When I had my Amiga I paid £90 for a 120MB (yes, Megabytes) hard drive. Which was cheap at the time.
I paid ~$200 or so for a 40 MB HD for my Amiga 2000... Later another ~$200 for a 2 MB RAM expansion for my Amiga 1200...
(And now you can buy a 500 GB drive for less than $79.95 on Newegg. Gotta love miniaturization.)