I just launched GoodScout. It monitors eBay in realtime but we are taking more of a product approach to monitoring. This allows us to get our users higher quality notifications within seconds of items being listed.
For example if you want to monitor the
Apple iPhone 6 Plus you can search our Product Catalog click
Add Scout. On the next page you can select all the possible attributes for that product (
eBay has over around 100 products for all the different variations of the
Apple iPhone 6 Plus and our goal is to make it as easy as possible to get instant notifications for these listings with a few clicks. Also we want to make sure our users only receive notifications for legit alerts for that product with the attributes they have selected & the condition/s they want. We do a bunch of condition filtering to weed out badly listed items (Used items as new, Broken items as Used, etc).
It's completely free to use so check it out, and I'd love and feedback, good or bad. http://goodscout.io