LightInTheBox offers the Nitecore D4 Li-ion Ni-MH NiCd LiFePO4 Smart LCD Battery Charger for $41.99. Coupon code "NITECORED4" cuts that to $21.50. With free shipping, that's the lowest price we could find by $6. It's compatible with AA, AAA, AAAA, and C batteries and features an LED display.
Note: This item ships from China and may take two to five weeks to arrive. Uncheck "Add Shipping Insurance to your order" during checkout to remove the 49-cent fee.