While there is an eBay app available in BlackBerry World for BlackBerry 10 users, it is an Android port. For some that is absolutely fine, especially since the majority of Android app runs quite smoothly with the latest BlackBerry 10 OS. However, there are many who would prefer a native BlackBerry 10 experience. One option for that is Shopping for eBay.
Shopping for eBay is essentially the website version of eBay wrapped up in a shell. Though it has got a shortcut to the Deals section if you check that out a lot. You also have access to a back and next icon to easily navigate previously visited pages. There is also a shortcut along the top bar that let's you quickly change country if you need to check out prices for a certain currency too. Pretty handy. At the moment, supported eBay countries via Shopping for eBay are - U.K., U.S., Canada, Australia, Germany and Italy, France, India, Malaysia, Philippines and Spain.
I like that I can have eBay standalone but Shopping for eBay is very much like using the web browser but I have found myself using it instead of just going to the browser the past week. I don't know what it is but I tend to download apps like this even though we have a great BlackBerry 10 browser. If it's something that interests you, check it out. It's free and available for all BlackBerry 10 devices.