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Did you have a look at the SainSmart DDS140 Digital Storage Oscilloscope 40 MHZ BW 200 MSa/s Sampling rate.http://www.sainsmart.com/sainsmart-dds-140-40m-200m-s-virtual-oscilloscope-black.htmlThe nice thing about this USB oscilloscope is that it has a feature connector on the side, which can be used to add a logic analyzer option or a signal generator option later on. Both of these options are very affordable.In fact the combination of a SainSmart DDS140 USB oscilloscope together with the signal generator option, is still cheaper than some Chinese signal generators.
Here is a cheap non USB scope, if you look around it gets good reviews within its specs.I am happy with mine.If you get one make sure it has a battery.http://www.amazon.com/DSO112-Oscilloscope-Display-Battery-included/dp/B01982W558/ref=sr_1_1?ie=UTF8&qid=1462994927&sr=8-1&keywords=dso+112