There's two left here for $104.00 US (free shipping)
I've read a few Chinese reviews on C3 this evening, one of them used GR07 as a test IEM with the player describing GR07 paired as underpowered and thin with lack of bass. I'm trying to find the review again with no luck as I happened to come across it on google images. It has a Cowon C2 next to the C3 in a photo. I'll be giving the C3 a miss, at 13mw there's not enough power for some of my IEM's.
If I find the review again (which I had to translate) I'll link it here as it went into decent detail.
thanks for this, helped me make up my mind.