and those $5 fusion max tanks are $12.95 for FIVE in the USA.
I don't know about the other gear you listed, since I don't use any of those, but I do know about fusion tanks, since that's what I use.
Migcigs charges $15 for 3 of their fusion tanks, but you don't have to buy from them if you don't want, because they're 808d tanks, and many tanks will fit on the batteries that I have. I'm using original mig cig tanks right now (made by kanger I believe), but I also have some clearomizers that I bought from a different place that I haven't tried yet, but they're at a higher ohm.
I haven't found any other place that has the 1.8 ohm fusion tanks though. That 5 pack that you list for $12.95 is not the same ohms I'm pretty sure and therefore less powerful.
I did a ton of research before I bought my first kit, and this was the best skinny e-cig kit that I found, and I'm very happy with it, as it helped me quit a 30 year tobacco cig addiction. I am getting powerful and nice throat hits with this kit, and I like that every hit is the same, and the battery doesn't slowly die out.