My first HD (not the first PC though) was a WHOPPING 12MB :o)
I think it was around $500..
The first mouse (1 button) was $126 >.<
I built a computer from a kit back in I think 1976 and an 8k (That’s 8 kilobytes!) memory card cost $440. And I had to solder in the 64 2102 chips.
Here’s the instructions I found online.