$50-$342 depending on how you want to started
An introductory kit start for as little as $50. The introductory kit allows someone to try out brewing, but most people that decide to pick-up the hobby will invest in a better homebrew kit which still only costs $150. After adding $40 of recommended optional eqiupment, you can still get started for less than $200.
Download Recommended Brewing Equipment List
For more details see the FAQ item “What is the recommended equipment to buy when first starting to brew?”