It varies (and ebay change it constantly too) but as a ball park figure; when I used to sell on eBay (items all below $15) I found that on average ebay final value fees worked out at about 9.5% plus an extra 3.5% for paypal.
So for a good estimate, expect to be paying 13% in fees for lower value items.
Have a look on ebay's fees page - varies according to type of item.
probably nothing i dont know for sure
also use this free website its just like ebay only you dont use CASH
https://www.listia.com/signup/556117
if that translates to close to 99 cents then the answer is zero
How much commission would ebay take from an auction ending at 99p?