RIM released an eBay Beta app for your Blackberry.
With eBay on your BlackBerry smartphone, you won’t miss out on what’s happening online.
Features include the following:

Real-time home screen notifications of bids
Calendar reminders and email notifications for auction end dates
PayPal™ compatibility***

http://appworld.blackberry.com/webstore/content/4557

It can be downloaded for free at BB Appworld.
It’s beta, so use at your own risk! Make More >