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Amazon [amazon.com] has NEEWER 2280mAh NP-FZ100 Replacement Battery Charger Set for $ 37.80. Shipping is free.
Product Description from Amazon
About this item[list][*]Two 2280mAh NP-FZ100 rechargeable replacement batteries[*]Two input ports (micro USB and USB Type C)[*]Compatible with Sony A1, A9, A9 II, A7R III, A7R IV, A7R V, A7S III, A7 III, A7 IV, A6600, A7C Cameras and VG-C3EM, VG-C4EM Grip.