As far as 'online' payment sources I think Paypal is the only accepted one...maybe Bidpay also if they're even around anymore. Otherwise it's just money orders /personal checks.
Always remember, PAYPAL and Ebay are joined at the hip. Ebay will never allow anything other than PAYPAL. I believe in Australia, Ebay tried or is trying to make PAYPAL the ONLY accepted payment. If that works for them there (legally), I suspect it will eventually happen here as well
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .