Google Play also offers a selection of 23 compilation albums for as low as $3.99 each during its Killer Comps Sale. That also puts most titles well below what iTunes charges. Choose from albums such as Now That's What I Call Music! 41, 2012 Grammy Nominees, Warped Tour 15th Anniversary Celebration, and more.
Of note, Amazon MP3 Store also offers many of these titles for the same price.