I'm surprised to find myself saying that the GMs Day Sale for 2021 is severely lackluster.
Although some titles ARE 40% off (including Swords & Wizardry Continual Light - a Gold Bestseller), the top dozen or so linked on the sale page are a mere 10% off. Barely noticeable.Of the six GMs Day Sale bundles, fully half are bundles of "Penny Dreadful One Shots for the Electrum bestselling Through the Breach RPG." How much are the core rules for Through the Breach? Normally 40 bucks, the PDF is on sale for a mere $24. You need the core book to use these bundles of one-shots.
Things that make one go "hmmm!"
Notice that Swords & Wizardry Continual Light is a GOLD Bestseller, a higher ranking than the RPG that has three of the six bundles for the GM Sale. Something seems off, as Electrum and even Gold aren't really that special in the grand scheme of DTRPG sales numbers.
Over the next few days, I'll try and locate some 40% of gems in this "ehhh" sale.