The price of a Seiko watch with a sapphire crystal can vary widely depending on the specific model and features. Some Seiko watches with sapphire crystal can be found for under $100, while others can cost thousands of dollars.
For example, the Seiko SARB033 has a sapphire crystal and can be found for around $400-$500, while the Seiko Presage SARX055 also has a sapphire crystal and has a price of around $1,000-$1,500.
It's worth noting that the price of a Seiko watch may also depend on factors such as the material of the watch case and bracelet, the movement used in the watch, and any additional features such as complications or special edition releases.