The Profoto B2 Location Kit has been substantially discounted and it’s probably to bring the kit inline with their Profoto C1+ announcement, which is being advertised as for smartphones but works with the Profoto Air Remote. I think they are worried that photographers will load up the new Profoto C1+ lights instead of buying the B2 since they work with the AirTTL Remote. It will be interesting to see if the C1+ becomes popular with photographers.
The Profoto C1 Plus is compatible with light-shaping tools such as color gels, grids, and domes, which provide a wide range of creative possibilities. The light-shaping tools snap on and off quickly with the C1 Plus’ magnetic mount. Use it hand-held to easily play around and explore different angles by simply moving the C1 Plus around or put it on a stand or arm with the built-in thread mount. You can even use several lights together. Since C1 Plus is also compatible with Profoto AirTTL Remotes, you can bring it along if shooting with a classic camera.
Profoto B2 Kit: B&H Photo / Amazon / Adorama
Profoto AirTTL F: B&H Photo / Amazon / Adorama
Profoto C1+: B&H Photo / Amazon / Adorama