They do make portable printers, but they're really designed for traveling salespeople and are easily 3x - 4x the price of regular printers. They also tend to be single sheet fed, which would be a major pain in the butt for multi-page reports. They also run right off of USB and do not require a separate power cord.
But $180 - $350 for a substandard inkjet is not really the way to go.
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