Which eBay analytics research tools should I use?

The start of an eBay store is mostly about not buying stock that just sits there. A lot of new sellers get burned on the first batch because they judge a product by how many listings exist, not by how many actually sell. I’d start by filtering regular eBay searches to Sold items and checking what a product really went for over the last few weeks. Then compare that to how many listings are still active, because ten sales next to three hundred active listings is a slow product. Run a handful of ideas through that before spending a dollar on anything.