There are different capacities in AA rechargeable and the cost goes up quickly for the higher capacity. Unless you are going through a bunch, it will take a while to get your money back.
The Costco AAs are a huge value, not the longest lasting but probably at the top for $/mAhr. If you need the camera to run as long as possible, lithium are the way to go as mentioned.
Lookup Project Farm on YouTube, he does a bunch of AA battery tests that are very useful, both for alkaline and rechargeable.