Is there a way to compare scuba diving prices at different locations around the world? I think the price for one scuba dive when you are already certified is quite comparable. I know that usually at the same location the prices don't vary too much, but between different places or countries sometimes even 10x. Tripadvisor gives reviews, but usually not the prices and one can't compare easily. I think this information is quite useful for people who scuba dive.
Shamelessly converting @RoflcoptrException's comment in a answer, Book Your Dive is a website which allows you to compare diving prices by location (say for example in Indonesia), and by package deals. They even have a blog post comparing resort packages with liveaboards.