Try modENCODE Total RNA-seq datasets for Drosophila - much of the higher level analysis results has been long included in FlyBase, however it's based on Total RNA time course series, so it's likely to have many ncRNA if you're looking for it specifically within the bams. Also check if anything more recent has come out of those labs (Celniker and Gravely labs I think generated most of that data).
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Take a look at RNACentral Drosophila entries. I don't see any esiRNA listed for Drosophila but at least it is worth a look.