Not sure if anyone on here has got a Geforce Now subscription, but if you have, my latest side project may prove useful...
I've written a scraper to scrape the prices for all Steam games available on Geforce NOW. Then I've built a report in a single webpage, containing a list of all 1400 odd games, sorted by price and discount, from cheapest upwards. There are direct Steam links for all the games.
You can check out the entire list at:
Geforce NOW Spy
Happy bargain hunting!