According to the Toys R Us catalog, you can get Donkey Konga with Bongos for $45. When I went to have a look, I couldn't see any copies, though. At Game Rush, though, I saw Jungle Beat with Bongos for $40 - $10 cheaper than if you order the bongos directly from Nintendo. So I picked it up because, even though I don't really like Jungle Beat, how could I pass up a second pair of bongos with a game that's cheaper than buying the bongos on their own?
Also, Donkey Konga with Bongos at Game Rush Melbourne is $40 - looks like they're trying to get rid of their bongo sets.