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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can look at uMyo ( https://github.com/ultimaterobotics/uMyo ) - it's fully open source, so you can run your own production. Although its price is a bit below $40 per channel (and that is full processing unit with its own MCU and radio channel, so you only need a single receiver for all devices on the PC side), so if you need 3-4 units - then it will be cheaper to just buy them. For 10+ you may order factory production, it will be cheaper at that point (but still, if you take into account all the necessary stuff and shipment, you are looking at ~$30-35 per channel at this quantity)