GOG is running an indie sale with over 400 games discounted and also DLCs.
Plenty of options under a few dollars, including some well known games like Deponia $1.14 and Rusty Lake Hotel $1.49.
Other popular games on sale include Darkest Dungeon (80% off, $7.19), No Man's Sky (50% off, $42.49) and Slay the Spire (66% off, $12.19).
Not necessarily historical lows but good prices if there are games you're interested in.