I was not able to find the commentary of R' Saadya Gaon to Iyov on Hebrewbooks (ex 1), Sefaria or through a Google search. I would like to know if this commentary is available anywhere online, free or paid.
It is indeed. The first 40 pages can be viewed for free, and the rest are behind a paywall at Otzar Hachochma. There are various options for purchasing passes to use Otzar Hachochma (for various lengths of time for various prices) in Hebrew or English, as well as the printing limits.
Here is the url: https://www.otzar.org/wotzar/book.aspx?24835