The Sony Walkman NWZ-X2000 includes a touchscreen OLED, together with some hardware controls. It has noise canceling - and Sony claims it's the best sounding walkman ever. It includes Wi-Fi and support for many music and video formats.

The OLED X walkman costs 350$ for the 32GB version, and 265$ for the 16GB version.

OLED type: 

3" Touchscreen OLED (432x240)

Merck - Advancing Display, Advancing LifeMerck - Advancing Display, Advancing Life