The Ninja Standing Desk ($159) is a fully portable standing/sitting desk that is designed for both travelers and those looking for a cheap standing desk solution.
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Pro Can be used as a sitting desk
By adding a third shelf it can also be used as a sitting desk by simply moving the laptop and keyboard down one shelf, and pulling a chair up to the desk.
Pro Cheap, undisruptive
Compared to other standing desk solutions on the market, the Ninja desk is super cheap and does not disrupt your existing office setup.