AWS Solutions Architect - Labbing costs

I just started going through ACloudGUru's course on CSA. So far so good, but I may look to supplement with PluralSight or Linux Academy
I'm going to sign up for a Free Tier account but was curious for those who have passed the exam, how much did you wind up spending by labbing? I'd like to lab heavy to maximize my learning experience.
I'm going to sign up for a Free Tier account but was curious for those who have passed the exam, how much did you wind up spending by labbing? I'd like to lab heavy to maximize my learning experience.
Comments
Just remember to turn off your instances when not in use.
Here is an example of my bill from last month.
Amazon Elastic Compute Cloud running Linux/UNIX
$0.00
Amazon Elastic Compute Cloud running Windows
$0.00
EBS
$0.00
Elastic Load Balancing - Classic
$0.00