Is rock climbing an expensive sport?

It's cheaper than many sports (skiing, for example), and roughly comparable to many others. As with most activities, you can spend more by getting the latest equipment and flying off to popular climbing destinations around the world. Or you can keep it very economical. Most Americans live within a few hours drive of a good climbing site, and if you camp out, a climbing weekend costs very little. You'll need a harness ($35 and up, but will last for years), and some climbing shoes (around $100 to $150 and will have to be replaced periodically). If you're just learning, you'll probably be with a partner who has a rope and most of the other equipment.