Mini portable oscilloscope
Jameco provides Xminilab - a Portable Small Mixed Signal Oscilloscope for $129.95. It's a portable version of (cheaper) XMEGA Xminilab.
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Features:
Mixed Signal Oscilloscope: Simultaneous sampling of analog and digital signals
Advanced Trigger: Normal / Single / Auto, with rising or falling edge and adjustable trigger level
Meter Mode: Average, Peak to peak and Frequency readout
XY Mode: Plot Lissajous patterns See the phase difference between two waveforms
Spectrum Analyzer with different windowing options and selectable vertical log
Horizontal and Vertical Cursors with automatic waveform measurements
Arbitrary Waveform Generator with Sweep on all parameters
Display options: Persistence, Different grid options, and more
Curve tracer function