I initially bought a pair of RHA MA350 earphones from Dixons Travel at Glasgow Airport a few years ago - they have a huge billboard just before the duty free section as I needed a pair for holiday.
For £29.95 they were great in comparison to my standard apple earphones in terms of sound quality and blocking out noise. I then found the RHA 450i's that come with a remote and microphone on Amazon for only £24.95!
They also come with a 3 year warranty which I thought was unheard of for earphones at that price point - absolute bargain!
If you haven't heard of, or tried RHA I recommend giving these a try