A look at what is currently available on eBay

2 Channel PC Computer Digital Storage USB Oscilloscope
US $22.38

2 Channel PC Computer USB Digital Storage Oscilloscope
US $29.90

Parallax 2 Channel USB Oscilloscope (2CH O-scope) 1Ms/s *BARELY USED*
US $129.99

us stock 2 Channel PC Computer Digital mini USB Oscilloscope new hot 2.0 cable [...]