Thanks! It is rather a long story. It's a combination of sheer luck, availability and timing!
There are quite a few websites that I scour while searching for the best deal, when it comes to music like fishpond.co.nz and realgroovy.co.nz. These sites have collaborated with sellers from many countries like NZ, the UK, US, Australia and India. And there was this one seller from the US, who was having a massive clearance sale and had just 1 copy left of the Rush box set! The other copy (with another seller) was going for an outrageous price of $ 61.9! Way over my budget! I do use Amazon.com and Amazon.co.uk, but only as a last resort, these days.
The sites that I mentioned (apart from Amazon) also provide International delivery services. So, please feel free to check these sites out, Sath! You never know what you may find!