Although imported cereals are available here in Mumbai, I have recently started making my own museli, it takes about 10 minutes and lasts me and my husband the whole week. The total cost is about equal to an imported cereal, so it works out to be financially viable too.
This is what I use:
400g Quaker Oats
200g Crushed Almonds (I buy them whole and stick them in the mixer)
200g Crushed Walnuts (as above)
A handful of Flax Seeds
I buy all the ingredients from Prabhat Provisions in Pali Market and it costs me about Rs650 in total, but I don’t use all the ingredients up each week, so it works out about Rs300 per week.