I don't know how to quote on HN but here's what they say in the article.
"Some of the equipment available is quite inexpensive. A rigged monitor cable that allows "TAO personnel to see what is displayed on the targeted monitor," for example, is available for just $30. But an "active GSM base station" -- a tool that makes it possible to mimic a mobile phone tower and thus monitor cell phones -- costs a full $40,000. Computer bugging devices disguised as normal USB plugs, capable of sending and receiving data via radio undetected, are available in packs of 50 for over $1 million."
"Some of the equipment available is quite inexpensive. A rigged monitor cable that allows "TAO personnel to see what is displayed on the targeted monitor," for example, is available for just $30. But an "active GSM base station" -- a tool that makes it possible to mimic a mobile phone tower and thus monitor cell phones -- costs a full $40,000. Computer bugging devices disguised as normal USB plugs, capable of sending and receiving data via radio undetected, are available in packs of 50 for over $1 million."