If you can get Eneloops at a reasonable price, that’s the best way to go. The Hobby King Turnigy cells are good, but their shipping is expensive. 99 cents each and $2.99 shipping for up to 5 makes them kind of expensive though. Shipping for 10 AAA’s is $5.99 and $6.99 for 15.
fran82 has some good tests of DX batteries, but even those are $5.99 for 4 (the B Tones):