Following up on the price reveal of the Rainmakers set, TFW2005 user Fast Draw found the set at his local Target in Massachusetts. The multipack consisting of Acid Storm, Ion Storm, and Nova Storm retails for $79.99 and the DPCI is 087-16-9185. As of now there is not a street date set up so once your Target gets them, they should be available to purchase.
Good luck hunting them!
Thanks to Dorksidetoys we also have the stock images of the Rainmakers. He also stated that they aren’t mainline items so it’s possible these might be Target exclusive figures.