We'll admit that a soundcard isn't the first thing that came to mind when we heard you could order the "Tube Delight" online. But that's exactly what it is, and it's the funkiest USB audio solution we've ever seen.
The portable PC soundcard comes encased in a transparent vacuum tube with a fade-in-out blue LED for power-on and idle status indication. It supports 16-bit 16KHz/32KHz/48KHz recording and playback with both rated at THD+N -73dB and SNR 85dB, and comes with the obligatory 3.5mm headphone and microphone ports.
Hong Kong vendor Brando has the USB soundcard on sale now for $32, which is as cheap as you'll ever find anyone selling anything having to do with a Tube Delight.