Is there any way to build in some pricing sanity checks? It seems like pricing is using available TCG cards to figure out a price in some cases. For some cards with low availability (notably P3K) this is causing insane pricing. See https://deckbox.org/mtg/Meng%20Huo%2C%20Barbarian%20King?printing=365&lang=us for the worst offender that I know of right now. I'm sure that it would be a bit of work to incorporate the new pricing at TCG Player that includes recent sales, but you can see that only 1 copy has actually sold for more than $100.