Check out this list of
content delivery network companies.
Some of them are unreachable for small firms like akamai and edgecast. But edgecast can be contracted through speedyrails for a small fee every month you pay as you go.
You can check them out here:
https://www.speedyrails.com/cdn
And edgecast have Pop's all over the world so
compared with Maxcdn for instance they are better.
I would try edgecast through speedyrails, if you don't enjoy the service you can always stop using them.