Now that Apple is slowly and quietly switching all its freshly DRM-free tracks to a popularity-based variable pricing scheme, we almost didn't notice that Walmart and Amazon have taken the same step.

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Amazon now has prices ranging from a low of $0.79 to a high of $1.29, the same as iTunes, and its highest priced tracks now make up ten of its top 100 list. Walmart, for its part, is a little cheaper, from a low of $0.64 to a high of $1.24. It looks like the music labels have finally gotten their way in this battle. [Electronista]