You can get a free 60v Flexvolt DeWalt battery with Select DeWalt tools and currently this deal is stacking with the 20 off 100 DeWalt on Amazon.

Edit: Appears to only be working on the circular saw for now. others will likely follow soon

https://www.amazon.com/gp/aw/d/B01H9BLW90/ref=mh_s9_acsd_bw_wf_a_DEWF9wat_cdl_0?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=mobile-hybrid-3&pf_rd_r=HK4M4STWMPCQNMYV1HPW&pf_rd_t=1201&pf_rd_p=268334c8-62c9-48c3-b139-0ddf30d17eb3&pf_rd_i=15019022011