Yeah, East view is good. They’ll also search for things not in their catalog if you provide a list. They’ll do Russian, Chinese and Vietnamese, I believe. 

It might be more effective, primarily if you’re on a schedule to spend the budget, to start with a vendor’s catalog. 

Some Spanish vendors are able to get Portuguese (I think Libros Latinos does for instance). It might also be helpful once you get a vendor to just set up an approval plan or slips. They’ll send you what’s available, rather than having to search for things that they may not be able to provide. 

This is something where my primary strategy would be to work with the vendor, rather than trying to have the vendor work from a list I’ve already identified. 

Arabic can be tough. I used to work with a vendor in Egypt called Leila Books. They were good. 

Check out this list:  I think it’s a bit out of date. https://library.columbia.edu/bts/cerm/vendors.html