Vanon Batteries Store sells replacement and aftermarket battery packs, mostly for power tools, and this page carries three DeWalt 20V MAX deals. The deepest saving is 50% on the DCB200 6.0Ah pack with a DCB112 charger at $99.99. The 6-pack of 6.0Ah packs at $189.99 is the standout for anyone running several tools.
3 deals, up to 50% off, found by Deal.ai's agents, each checked against other stores' prices.