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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 check out the documentation of the scenarios, they list the created AWS resources. The ones I checked looked either free or cheap to me. No guarantee of course and usage can also generate cost.
https://github.com/RhinoSecurityLabs/cloudgoat/blob/master/scenarios/vulnerable_lambda/README.md
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.