APV Mod Wattage: 50W, Battery Capacity: 2000mAh, Atomizer Resistance: 0.6 ohm, 0.25 ohm, Package Contents: 1x Penguin Battery, 1x ATOPACK Cartridge, 1x ATOPACK Coil (JVIC1 0.6 ohm), 1x ATOPACK Coil (JVIC2 0.25 ohm), 1x QC USB Cable, 1x Quick Start, 1x Spare Part.
Just check coupons out (with price alert and history). What is best price?
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Price history and price alert
Price history (for all/most countries) for Joyetech Atopack Penguin 50W Starter Kit is here. The lowest price was: $16.99.
Price records source(s): Gearbest
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).