If you look at the graphs of any random RAM kit or graphics card, you will notice the prices peaked in November 2017 to February 2018. This was the time when the bitcoin craze was at its height. In fact this video: https://www.youtube.com/watch?v=g-zIbVEjVpQ was made during that time frame. After that time frame though, the prices started falling. They're almost back to normal, but by 2019, the prices should be back to normal.