SSDs isn't still expensive. Prices has gone way down lately...
Not expensive, may be that is not the word I should have use. But according to [1] ,its price is barely the same as 18 months ago, and if you look at longer term, price hasn't dropped much compared to 24 to 36 months ago. And I was speaking in the context of servers, in terabyte of Memory and Petabytes of storage.
[1] https://pcpartpicker.com/trends/price/internal-hard-drive/