The cost of a rowing machine varies depending on the make and model of the rowing machine but you can get a rowing machine at Walmart for $150.00 or less.
Or some other rowing machines when bought elsewhere can be had for $900.00 to $1,500.00 depending on how many features and what brand of rowing machine you buy.
Even a cheaper rowing machine will usually give you a good workout but if you can afford the higher cost rowing machines then they can usually give you a much better workout than the cheaper ones.
Also the higher priced rowing machines may last longer than the cheaper ones do.