Check for a culture collection near you or order it from international culture collections like DSMZ etc.

But ask in your or other universities too, some of them surely have it.

You can procured from the companies or asked to scientists who are working

You can procured from the companies or asked to scientists who are working

https://www.thermofisher.com/order/catalog/product/18313015#/18313015

https://www.protocols.io/view/making-electrocompetent-agrobacterium-tumefaciens-xyqfpvw

Well, You can contact IMTech, Chandigarh for the cultures.

You can contact a good number of Universities where they do maintain cultures of Agrobacterium.

Probably, they will provide the cultures in lyophilized forms which needs to be revived in the specific media.