I don't know what kind of sampling rate you are looking for, but you might check: http://www.usbwholesale.com/oscilloscope.htm It sells for $189 and sure looks good for a hobbyist - I'm thinking about picking one up. "The DS2200C 2-channel USB digital oscilloscope sets a new price / performance standard for entry levels DSO's. It features 12-bit ADC resolution, a sampling rate of up to 200KHz on both channels , AC / DC coupling, separate input level controls on each channel and comes complete with high quality Windows software with oscilloscope and FFT display. An ideal portable testing solution when connected to a laptop PC. The DS2200C comes complete with our EasyScope software package which offers an attractive Windows based oscilloscope display, with single, dual and XY modes, and the capability of displaying the frequency spectrum of the input signal using it's inbuilt F.F.T. function." Please Note - A pair of our high quality DP60 Oscilloscope x1 / x10 probes are needed. The probes are NOT included in the package but can be purchased separately below. Features Portable Lightweight Attractive, easy to use visual display Single, Dual and X-Y display modes F.F.T. ( Fast Fourier Transform ) display Time Base from 50uS/Div to 1 sec/div Input Ranges from 0.1v / div to 5v / div O.S.D. Markers for voltage measurement O.S.D. Markers for time / frequency measurement Save Oscilloscope Screens to Windows BMP files Oscilloscope Screen Printout Facility AC / DC coupling support Support for x1 / x10 probes (Probes are NOT Included) Customizable Oscilloscope screen colors and background -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.