My understanding was that Jerry simply doesn't share the INFI. Scrap Yard's SS4 was a one-time opportunity (perhaps because the Rats had been allowed to sell a small run of INFIcoots). So, I don't believe INFI is an option for any other Scrap Yard releases.

At the risk of asking a question that's been asked over and over again, how much "better" is INFI than SR77? Other than better corrosion resistance, does INFI really outperform?