I took the CSM from Scrum Alliance (https://www.scrumalliance.org/certifications/practitioners/c...). It’ll run you about $900 to $1400 depending on where you’re at and what instructor you choose
Your mileage from the course may vary (depending on how good your instructor is), but in the end what the course helped me do is internalize the scrum process and Agile principles better. I really got to see the value they bring to a development team.