I have mentioned some sources for procuring opamps in a page here >> https://docs.google.com/document/d/1x1hsqjGANBp2Fq5aDkUtXVna3pNEwk5XPXZQytHAQ0M/edit?pli=1
Let me know if anything is not clear.
Regds,
Essence one has NE5532P and LM4562NA op-amps
What op-amp should replace NE5532P op-amp?
What op-amp should replace LM4562NA op-amp?