3rd party transit for anycast services?

Hi, We have an anycast provider (internap) that cannot give us direct service in the AU region. I'm wondering if there are providers, not specifically internap, that will allow another local ISP to 'transit' anycast IP services thier behalf? Would a local AU provider want to do this? I'm thinking that this not common practice and probably not desired. Any feedback is greatly appreciated. Cheers. Carlos.