[Radioman]

I don't know exactly where they are (ebay tells Honk Kong for all) but try to look at these stores

Negozio eBay - DIY Gene: Accessories Parts, LITE Audio products, Tube Pre Amp

Negozio eBay - gigawork shop: DAC Kits, Component, Amplifier Kits

Negozio eBay - 8Audio: Pre-Amp, Electronic Parts, Connectors

and these sites

DIY Gene Home Page

Worldwide Supplier of Shuguang Beijing Vacuum Tube Amplifier and Hi-Fi Audio DIY Kit Accessory

Diyclub

JA Audio Equipment and Development Company

Kitsparts Store

and save a little pcb card for me.... ;-)