The answer, of course, depends on the type of mountain bike you're looking for. An entry-level hardtail mountain bike might cost as little as $500, while a top-of-the-line full suspension bike could run you $5,000 or more. However, most people fall somewhere in the middle, with a mid-range hardtail costing around $1,500 and a mid-range full suspension bike costing around $2,500. Of course, prices can vary depending on the features and components you choose, but this should give you a general idea of what you can expect to pay for a mountain bike.