Or a quick google search turned up a few options. https://www.google.com/search?q=usb+cover&source=univ&tbm=shop&tbo=u&sa=X&ved=0ahUKEwjGiNCY2NrSAhVJziYKHTwPDVIQsxgIHA&biw=1920&bih=1009
The port blockers (https://www.google.com/shopping/product/2057481274135843292?q=usb+cover&biw=1920&bih=1009&sa=X&ved=0ahUKEwj_1_vS2NrSAhUJ7iYKHfasD8sQ8wIIqAIwAQ) look interesting, but I'd bet they could be fished out with a paperclip.
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