Some online comic platforms might have Dilbert comics. For example, Comixology or Webtoons could be worth checking out. But make sure to check for the licensing and availability in your region.
You could search on popular comic-sharing platforms or online marketplaces. Just make sure you're accessing them from legitimate sources to support the creators.
Many libraries have Dilbert comic books. You might check your local library's collection. Also, some online comic platforms offer Dilbert comics for free or with a subscription.