The DScope from Dreamsourcelabs is a 2 channel oscilloscope with 50 MHz analag bandwidth and up to 200 MSPS (100 MSPS dual channel) for about 100$ now. The reason i bought it was that the DSView software is open source and runs on Linux (C++/QT5 based), unfortunately the development and the company seems pretty much dead now. It started with a kickstarter campain in 2013/2014 and the DSLogic 400 MHz Logic analyzer, this device is also based on that. Following a quick hardware overview.
It uses the CY7C68013A USB interface for communication with the PC. The processing does the Spartan-6 XC6SLX9 FPGA, which utilizes MT48LC16M16A2 SDRAM as 256 Mb large sample memory.
The main AD9288 does dual channel analag to digital conversion with 100 MSPS. There is a CPC1035N solid state relay and a FTR-B3GA4.5Z relay per channel, these make the noticeable clicking noise when switching voltage ranges. It also contains 2 potentiometers per channel, probably for calibaration purposes.
Not much on the bottom side, mostly SMD capacitors.