So does anyone know what's the cheapest I can get GTA IV: Complete Edition?
That is vanilla GTA IV and he wants this - Complete Edition. Going by Steam price and discount for this game (-70%), in the next Steam sale it should be available for ~ ₹300. @BakBob your best bet in getting it cheap is either foreign low value market like Brazil (Nuuvem which I shared before) or Russia or keep an eye on Gamersgate where there is a chance of getting it at ~₹220 in their next sales.
This seems like a bad deal, it was going for 99 on steam a few days back on publisher sale.