As always, different individuals have different budget concerns, and your LGS may not always be the cheapest option, so consider what works best for you and your personal needs
Like most Magic: The Gathering cards, the value of Price of Progress depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (The List)
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If you need a copy you can snag the Ixhel, Scion of Atraxa lead Corrupting Influence precon, although outside of Phyresis Outbreak itself there isn't much value in the deck with the next most expensive cards being Karn's Bastion and Glistening Sphere at around $4