As I always have to point out...building your own coils is the way to go
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Not in my experience.
The cost of buying everything you need to make your coils would cost me about 5 years worth of premade coils. I routinely get 2 months of use out of a single coil. My wife has managed to get more than 4 months out of a single coil. Together we only spend about $30 per year on coils.
And then there is the time issue. I'm a systems administrator which means I'm on call 24/7. I've got a wife and child, and a dog I have to take care of. House, 4 cars, and of yeah, did I mention that I build race cars as a hobby? I don't have the time or desire to spend hours learning the fine art of making coils that I can simply buy and replace in seconds.