According to cast members we spoke to, this is a test run to see how they sell outside of Pandora – The World of AVATAR.
Currently, there are 10 color variants of the banshee toy (12 if you include the 20th Anniversary one and the upcoming Pandora First Anniversary one). While all of them are available at Windtraders, the blue/purple and purple/blue variants are also available both at The Outpost Shop and online at ShopDisney.com. The orange/red variant is also available at The Outpost Shop. And green/yellow, red/blue, and yellow/green are available at ShopDisney.com.