Need help wit Buying a Block Account from an NL providers

What is the best practice for doing that.
I live in the US. I know when I used Astraweb as a monthly news provider my bank charged me about 3 percent fees. Would there be any additional fees purchasing a service through a NL Usenet provider. Can anyone recommend a good prepaid card to use?
I live in the US. I know when I used Astraweb as a monthly news provider my bank charged me about 3 percent fees. Would there be any additional fees purchasing a service through a NL Usenet provider. Can anyone recommend a good prepaid card to use?