1. There is no pirated PS4 disc. Heard b4 cases of fake PS4 disc but it's extremely rare and mainly on second hand market? New and sealed from retailers confirmed is original

2. Those Lazada RM50-100 usually it's digital copy and abuse Sony gameshare feature. They bought digital copy from Sony PSN store under an email account (usually during very cheap sales) and then sell/share it to 2 ppl (1 with full-function and can go online, another 1 just solely play offline after download). Beware that this can get your console banned by Sony.

3. There is legit 2nd hand market where games can be very cheap, even for AAA titles. Sony also unveiled a new campaign last month called PS4 Greatest Hit where most of their exclusive titles are sold at RM74 - Bloodborne, Unchartered 4 etc.

Sony exclusive AAA title can easily fall to around RM100-120 within a year in the 2nd hand market. This is because after >6 months, you'll see Sony starts to do discount on PS Store. And usually there's also more copies in circulation for big titles