I had a hard time too, the ego mega one thread helped me out (I searched, but can't find the thread). I used vapeshop.com and I did wind up having to get the V2, which I'm okay with, it was fairly inexpensive as well, I think around $14 including shipping.
I had an ego one that whistled so I gave it away, but the Wismec tank I was using with those coils died, and I decided I wanted something of larger capacity. I am assured by the experts on that thread that the whistling I had with the coils in it then will not reoccur with the CLR coils (which I also LOVE deeply) so I'm keeping my fingers crossed. Vapeshop.com was really easy to deal with and have sent me a shipping notice already (
)
Might be worth a try unless you are absolutely wedded to version one, which I couldn't find ANYWHERE all out of stock. Even considered a stick setup, also out of stock.
Best of luck,
Anna