The primary reason people use eBay over Amazon for the same product isn't lack of price comparision, it's shipping. A lot of these resellers offer to ship the product to a broader range of companies than Amazon. Anyone who has lived outside of the US will know exactly what I'm talking about. I live in Canada and Amazon.com will list a simple product for $20 and the same one will be $35 in Canada, for no apparent reason (that goes well beyond tarrifs). Plus shipping will be another $10 when it's nearly free in the US.

This is why 3rd party arbitrage is good for the economy. It fills in gaps in supply/demand.

Edit: also I should note that Ripple Rug looks awesome. Buying one for my cat. Articles like this talking about your business experience are good marketing engines :)