On the other hand, for products like Secret Lair drops, Commander decks, or other preconstructed / box-set supplemental products, we used the cost of buying the sealed product (which is generally lower than the cost of buying all of the cards in the product individually) from around the time the set was released (for sealed product, you'll often pay much more if you wait until the set goes out of print to try to buy it)
There are a massive 264 decks with it leading in just a few weeks over at EDHREC.com so it's finding an audience, and I agree with it
By being patient, doing your homework, and using the right tools, you can make sure every purchase is a smart one
Some of the most powerful examples come in the form of commanders like Geist of Saint Traft, Narset, Enlightened Master, and Uril, the Miststalker
Stay with Me / Rhystic Study (FCA) $100 WotC's bent on weaving these two Final Fantasy characters into as many I'm not crying, you're crying! moments as they can