At the moment this is a Prime members exclusive offer, Amazon itself is offering the DJI DJI-P3-Battery Intelligent Battery for Phantom 3 for $102 with free shipping. If you are not a Prime member, various 3rd-party sellers have it for this price and are Prime eligible (fulfilled by Amazon) but be sure to thoroughly vet them before buying if you are not familiar with them.
On the other hand, if you need both the DJI Phantom 3 AND an extra battery (which as you can see goes for $100 on its own), you can get them bundled up together for $450 at Adorama.
On the other other-hand, if you don’t need the extra battery, the Black Friday Ads have this as low as $370, which means by actual Friday, the internets are likely going to price-match it (barring some kind of an exclusive deal of sorts).
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