Report The problem with the Woo Audio 3ES in Headphone Amplification Posted Saturday at 07:36 PM I was quoted some prices from a Chinese seller last year and these were around 100$ each. Genuine parts and not pulls either. No idea who that seller was but it was through one of those marketplace sites, UT source or one of them. No idea how they can make that amp so cheap but part prices are usually around half in China compared to what we see. Also plenty of stuff that gets "lost".