The Eleaf Istick Aspire Mini Nautilus kit comes with a 20 watt Eleaf iStick variable volt variable watt battery and a and a nautilus mini clearomizer tank. Price for this specific kit is $44.99.
Purchasing from other sites may wield a better price but will not come as a kit.
SpecsUpdate
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Pros
Pro Custom kit of battery plus tank
Included in the package is an Aspire Nautilus Mini adjustable airflow bottom vertical coil tank, 2200 mah 20 watt variable volt (3.0V to 5.5V) variable watt battery and an eGo 510 threading adapter.
Pro 20 watt variable volt variable watt 2200mAH battery
The Eleaf Istick is probably the most popular batter for ecigarettes today. It is a 20 watt variable volt (3.0V to 5.5V) variable watt 2200mAH battery that has an included led display.
Cons
Con Aspire bottom vertical coil atomizers used in the Nautilus Mini tank are hit or miss
Aspire currently has manufacturing issues with their BVC coil in that not all experiences using them are optimal.
Con Not a traditional "kit", may need to have individual components purchases separately.
The Eleaf Istick Aspire Mini Nautilus kit is not a traditional kit offered by all shops and thus may need to be purchased in separate pieces.