Shopping on eBay?

You probably didn't finish the transaction. It happens if you are not familiar with ebay. You can look for the kind of cord you needed in the search field, and it will show you that the one you wanted is sold. You might even see your bid in the "my ebay" section under that same listing.
When you "Buy it Now", no one else can buy it unless you don't finish the transaction. The seller doesn't know you tried, only seeing the person who actually finished.

Sometimes, you think something is done, but you have to scroll down to the bottom of the page and hit continue, or submit purchase or something similar. I hope this helps.
PS: If you get on the companies website, assuming they are still in business, you will no doubt find the cord you need. Good luck!!