Obtain CHO-DG44 - how ? (Jan/14/2011 )

Hi there,
I am actually looking into buying CHO-DG44 for my firm, but it seems that the only way is to buy from Invitrogen, and it costs a lot !!!
Aren't those cells available at the ATCC or EACC ? Why not ?
Do you have a any idea ?
Thanks in advance for yoyr help.
Take care

Commercial use of a lot of cell lines and similar things is prohibited by the license for use or MTA... which may be why they aren't available in "free" sources such as ATCC.. or it could simply be that no-one has submitted them.