Unfortunately, it's not cheap. You're looking at $10+ per roll in development, and I'm guessing one roll of Ektachrome will be $10+ if it's anything like Provia/velvia. $20+ for one roll and that's without scanning which many have a lab do.

Don't get me wrong, I love slide film and I'm so excited to shoot this, but it's not exactly easy to make a habit out of shooting E6 for hobbyists.