I still haven't found a SillyScope for under $100, but then again, I've got a nice Logic Probe from Radioshack that's mostly untried for . . .. . . waaaay longer than I'd like to admit! :I

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If you've got an old PC or laptop to spare, look out for an old Tektronix TWD120. It's a SCSI-based 100MHz scope, controlled by software on the PC. System requirements are very low, the software was designed for Windows 3.1, but it works in all newer 32-bit Windows that I've tried. The nice thing about a PC-based scope is you can capture images of your waveforms. I've seen them go for next to nothing on eBay in the past.