OK, maybe you can get a Rigol for $400.
I checked out picoscope:
https://www.picotech.com/oscilloscope/2000/picoscope-2000-overviewThey're not too cheap either. For _2_ channels, 25 MHz bandwidth, 200 MSPS, it's $199.
I'm shooting for $99 for _4_ channels, 100 MHz bandwidth, 125 MSPS.
Also, the main point is that mine is totally open-source (including firmware!). Picoscope and others I'm aware of don't let you easily play with the firmware. Why's that important? Access to the firmware gives you amazing flexibility. You can code up your own custom trigger, for instance. Make some custom combination of external input and some combination of ADC inputs, etc. It's also a great learning platform for students, etc.
Plus it's open hardware. People can adjust the board design, using a different ADC, or more powerful FPGA, or add RAM, more or fewer channels, add a DAC for waveform generation, whatever.
I think the ability to plug mine together for many channels is also a killer feature I haven't seen elsewhere. I have 3 plugged together on my desk right now, giving me 12 channels at 125 MSPS!
Thanks for subscribing!