Hello 'chaz...',
When you click on the My eBay at the top of this page, do you not see an ebay bucks logo beside the 'sign out' link? If you are registered in the ebay bucks programme it should be there with the amount next to it. Clicking that should take you to the info page which will show you how much you have.
Here is a link about ebay bucks if you have not already seen it:
http://pages.ebay.ca/help/buy/using-ebay-bucks.html