I get my Duracells at Costco. There's one toward Woodinville from Maltby. 14 of them for $19 or so.
Still, that combo that Hans (
@4regt4) suggested looks like one that will work well. I was serious about checking out that $12 charger...I like to be able to recommend stuff from personal experience and I've done quite a bit of charger testing in the past — I even used to have a "column" on RC Groups years ago called "Recurring Charge" where I did that sort of thing and wrote it up....but rockets came back into my life about 12 years ago and I've not done much RC airplane-related equipment testing since. Instead I've been obsessing over testing altimeters....