Question about Xeon Kentsfield line

[asdftt123]

As far as I know, the only Kentsfield Xeons available are the X3210, X3220, and X3230. I know the X3210 and 3220 are available in both B3 and G0, but what about the X3230? If I purchase the X3230 am I guaranteed 100% to get a G0 stepping? Also, are there any websites or retailers that will guarantee a G0 stepping X3220? Thanks.