Persona 2 duology are both available on the PSP. Eternal Punishment is a PSN download and IS should be fairly easy to find used, just be careful about spending too much. I think it may also be available on PSN as well
Shadow Hearts may be an issue as it never got a digital re-release and a quick scan of some online prices has this series a bit jacked up from the last time I checked. I would either look around for a good deal or likely just go straight to emulation for this series if you can't find a good deal.
SMTIII is about to get an HD remaster for the PS4 and Switch so you can always just wait it out, otherwise, I think it is also on PSN.
Xenosaga is another difficult one to get here as Namco just doesn't believe there is enough of a base to release it digitally. So you're going to have to either emulate or dust off that PS2. On the brightside, unlike Shadow Hearts, a quick scan of amazon shows that all three entries are fairly cheap and easy to acquire so at least you won't break the bank. I've found the first two entries for under $10 and the third entry for $15 from just googling it right now.





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