It would be awesome if you included shipping in the total price(or at least for certain countries). I know bookfinder does that, as some people add an extra $100 to several hundred dollars to the price which skews the results.

I think ebay technically frowns upon excessive shipping as some sellers use it to get their items higher in certain search results due to a low base price, but ebay doesn't really apply enforcement to their sellers on these soft violations most of the time.

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It seems some of your filters like "storage type" are must include and when unchecking it all the results disappear, while others like "OS" seem like a filter and when unchecking the results increase.

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I'm not seeing many chromeboxes in the results so maybe they are being filtered out?