I rebuild my coil and it's super cheap. A multi meter is a must for rebuilding. With tight supplies, this is the best option. For those who does not want to spend more dollars by buying a torch, u can use your kitchen gas cooker to oxidise the wire mesh. So far VV Nova is the best for me as it can last me about 2 days without topping up and the the Vapour production is damn f--king awesome!
Actually there are windproof lighters sold for about a dollar which works almost the same way as a torch!
Also, for people getting a multimeter just to test out the coils, u may want to get them from eBay at a cheap price