I have used PayPal for smaller amounts. I don't know about the eBay seller account. When I bought some CDs from Australia through eBay, I just sent the money in $ through PayPal to the seller's PayPal account. I'm not sure how many Australian $s the seller got; PayPal would have done the currency conversion.
It does seem as if PayPal would be the easiest way to transfer money internationally. Here is their page with currency conversion information:
https://www.paypal.com/us/cgi-bin/we...c_send-outside . (If this isn't clickable, just go to
http://www.paypal.com and search for currency conversion.)
For large amounts of money, I have always used a bank wire transfer for safety. There are also services online you can use, which are supposed to give you better currency exchange rates, but the one time I tried I found it much more complicated than just taking all the information down to my bank.
If you deposit a check in foreign currency, I think the bank will convert it into dollars for you. However, bank currency exchange rates are usually less favorable than others, I think. (Although I found them okay for the last wire transfer I made.)