Searching on any word makes it virtually useless as it returns so many false positives, averages items with the price of accessories for those items resulting in artifically low prices etc.. I buy and sell a lot of synthesizers and searching for market leading brands, the results were useless. Also, you blank the search box after every search so if I want to refine my search I have to retype everything. This is not MVP yet, you need to do some sort of SKU lookup.
Nice idea. As I'm living in Europe I'm not so interested in American prices, eventually you want to expand it to € as well... Sometime...
And please round your prices to max of two decimals.