I have been working hard to bring a new eBay application to the BlackBerry 10 system. I released the app last week and it released in the UK; this morning, version 2.0.0 of the app got approved and now you can easily switch between eBay UK and eBay US. I plan to add additional eBay countries in the future.
Currently, the app is available to everyone worldwide and you can use both eBay UK and eBay US to bid, buy, watch and sell items on eBay - enjoy!
Get it at BlackBerry World - BlackBerry World - Shopping For eBay