Update (11/7 6:00pm): Amazon is also offering a 4-pack of AAA eneloop Ni-MH Pre-Charged Rechargeable Batteries for a very low $9.99 Prime shipped.
Update (11/6 11:25am): Newegg has an 8-pack of POWEREX MH-8AAI-BH 2400mAh AA Rechargeable Batteries for $19.99. Coupon code EMCWWPF77 drops it down to $16.99 shipped.
Amazon offers a 4-pack of eneloop XX 2500mAh Rechargeable AA Batteries with 4 Position Charger for $20.99. It’ll ship free for Prime members (free trial), but all other buyers will need to spend another $14 (order two?) to get free shipping. As a pricing comparison, this set originally sold for $35 and today’s deal is the best price we’ve ever seen by $5. The new, Panasonic-branded set is currently selling for $30.
Eneloop XX rechargeable batteries come pre-charged and ready to use. Even after a year of going unused, eneloop batteries will maintain 75% of their charge. Expect to keep these batteries around for a long time since they can be recharged up to 500 times. Nearly 7,000 Amazon reviewers rate this set a spectacular 4.6 out of 5 stars.