Welp -- if we're necro-posting, Solid Commerce is a great inventory management option!

We're built out to help with multi-channel selling. Which means you can sell from your own webstore as well as Amazon, eBay, Rakuten, Half.com, Overstock, and a ton of other marketplaces. And we're constantly adding more to the list.

Even better is the fact that we also help you manage just about EVERY part of your online selling -- inventory, orders, listings, customers, shipping, and more -- in a SINGLE interface. Pretty snazzy stuff.

Take a look at our website (www.SolidCommerce.com), and anybody is welcome to shoot me a PM for some more information.