What is the best way to get pictures for a site
 

I am planning to expand my picture based website, and I would need to get a lot of new / fresh / high quality xxx fast. I am planning to contact all the biggest (and the smaller ones too) sponsors and ask them for that (besides, some / most of them have downloadable content sections, but this may take some time to do).

Do you have an idea what would be the best / most efficient way to get something like that to work. The number of pictures can be unlimited, 1,000,000 is fine... It will be all uploaded through ftp, visible on the site right away, and I will be working on adding descriptions over time. I may connect all the pictures with affiliate urls of the sponsors, if this would be something that could help in getting them...

Thank you.

The only thing most sponsors offer are .ZIP archives per gallery. They tend not to have bulk zips as the best sponsors release galleries on a regular basis.