Gregory Estrade today announced the availability of the Guimauve 2000, a VGA adapter for Apple //c and IIc Plus computers. The Guimauve 2K is essentially a specialized CPLD-based scandoubler, converting 15Khz video signal to 31Khz. It is available now for EUR 75, or USD $115 shipping included. Please allow 2-3 weeks for delivery.
Euro-//c models may need to use a slightly different firmware to accommodate 50Hz vertical referesh rate. Be sure to specify what model/region your Apple //c is when ordering.
The Guimauve 2000 was recently unveiled at VieuMikro 2009 (event coverage provided by Obsolete Tears). The site is in French, but the Babel Fish translation is available here.