The price usually depends on the severity of the clog and the cleaning method. For more details, see https://bens.plumbing/blog/how-much-does-drain-cleaning-cost-in-seattle/ . If it's a simple clog and can be cleared with a drain cable, it's usually cheaper. If a more serious cleaning is required, it's more expensive. In any case, it's best to check in advance, as diagnostics are sometimes charged separately.