Newest addition to the inventory is this super solid 3 bearing camera slider that showed up on ebay last week. See Modern Filmmaker Review Here. Most sliders that you will find in the $280 price range are "A" usually going to be friction rather than ball bearings and "B" will feel cheap. The Konova camera slider not only feels very solid but also comes with some very nice bonus features such as top and bottom threads in addition to the more traditional center thread. This gives you the ability to mount the slider in some unique ways as seen below.
Back up on eBay: CLICK HERE