While most of these resources could be still valuable, to avoid buyer's remorse, pay attention to the publishing dates, as some of them are very dated:

2022 - $18.95 - Build a Weather Station with Elixir and Nerves

2022 - $18.95 - Build a Binary Clock with Elixir and Nerves

2022 - $15.00 - Programmer Passport: OTP

2022 - $15.00 - Programmer Passport: Elixir

2021 - $27.95 - Testing Elixir

2021 - $26.95 - Concurrent Data Processing in Elixir

2021 - $22.95 - Genetic Algorithms in Elixir

2020 - $27.95 - Real-Time Phoenix

2019 - $26.95 - Programming Ecto

2019 - $28.95 - Programming Phoenix 1.4 (Current version is 1.6)

2019 - $26.95 - Property-Based Testing with PropEr, Erlang, and Elixir

2019 - $24.95 - Designing Elixir Systems with OTP

2018 - $27.95 - Programming Elixir 1.6 (Current version is 1.14)

2018 - $27.95 - Craft GraphQL APIs in Elixir with Absinthe

2018 - $26.95 - Functional Web Development with Elixir, OTP, and Phoenix

2018 - $24.95 - Learn Functional Programming with Elixir

2018 - $24.95 - Adopting Elixir

2015 - $11.00 - Metaprogramming Elixir

2014 - $27.95 - Seven More Languages in Seven Weeks

I'm not an elixir programmer but I saw that and decided to pick it up

Wonder how they can offer a bunch of book for a low price.