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Amazon has Craftsman V20 4.0-Ah Lithium-Ion Battery (CMCB204) on sale for $35.10. Shipping is free.

Thanks to Community Member Taco_Doomsday for finding this deal.
[LIST][*]Note: Estimated delivery dates may vary by location. Earn 10% back on this item when you pay with your Prime Card (more information). To verify, you should see “Get 5% back, and additional rewards on select items charged to this card” listed in the ‘Paying with (your card info)’ section at checkout.