Well, I think it's possible to find out whether a shop sells a X3210 with a G0 stepping. Where do you reside? German online shops normally deliver only nationwide + Austria + Switzerland.
Greez
EDIT:
So finally I found what you're looking for, that's the good news:
Intel® Xeon® Processor X3210 - SLACU
But unfortunately there's just one single shop in Germany that lists the X3210 G0 and the delivery time is unknown because they haven't it in stock:
Trend4PC - Intel® Xeon® Quad X3210 (Box, LGA775) SLACU 40802210-G0