Try Yahoo Japan.. there are some there right now.

i don't know of any other place that regularly 
has DB Genga.. oh except miki's junk jungle...

Apart from that why don't u browse cel galleries 
& make offers on cels u would the genga off.. 
alot of ppl do not value the genga as much & may 
part with it.  Of course there'll be rejections 
as ppl may like the genga or want to keep the 
complete set but it's worth a try & prob cheaper 
than Taro.