Mouse chromosomal location blots--NEEDED

[William Milford Rideout III Wellcome-CRC]

Hello,


I have recently cloned a small PCR product and am interested in quickly 
determining its chromosomal location in the mouse genome.
I'm looking for a company that sells southern blots of somatic cell 
hybrid-lines which contain single mouse chromosomes in a hamster background.
This would allow determination of chromosomal location with a single 
hybridization--very quick! Please e-mail addresses or phone numbers of 
any companies which sell such things.

Thanks,

William Rideout