mmmm usually around 7 pounds for a single spoke, less (per spoke) for two. You can do it yourself (tis cheaper and dead easy esp if its nt on the drive side of the rear - you'd need the tools to remove the casette) but even then its not diifficult nor is retruing the wheel. However I have found that spokes just keep on going - especially if they're not stainless steel spokes - so maybe best to get the whole lot replaced. Shall I assume its a rear wheel, drive side??