Depends on the region, if you're in the US I think it's still up for purchase, but for example, my main PSN account is UK based and you can't buy Resistance 3 digitally from the UK PS Store (or maybe it was Resistance 2?). As such, I had to ask a friend to grab me a cheapo 1£ used copy from CEX a short few months before the pandemic. Also, you can only buy digital games from the PS3 console itself which is a pain in the royal butt nowadays (fuck you Sony for making things harder!).