What is the best album you should get from iTunes but is also cheap?

I'm trying to get more songs onto my iPhone from iTunes but I don't know what cheap album there's that has lots of good songs on. I like any kind of music but I don't really like the rock and roll music. Perhaps country like Taylor Swift but I've already bought her album,"Red." So what other great albums are there and also like modern music and perhaps some in the charts?

Emblem3 Nothing To Lose, is a great album. It is pop. They have some great songs. It is not that expensive either.