I'd also suggest looking at Delphi Classics - they have the complete works of Virgil -- with some older PD translations of the Aeneid (including dual Latin & English texts for some - for those wanting to read the original text) - in both ePub (
http://delphiclassics.com/shop/?p=2654) and Kindle (
http://delphiclassics.com/shop/?p=730) -- DRM free and $1.99.