Refurbished heart rate monitors - available from online retailers
Like most electronic things, you can buy refurbished heart rate monitors online from a number of retailers. The big question is, why would you? Even though heart rate monitors are relatively new to fitness industry, more and more of the leading manufacturers, such as Polar and Timex, are making inexpensive entry level models making it unrealistic to purchase refurbished heart rate monitors.
You can get a very good heart rate monitor for between $100 - $200 US. Since refurbished heart rate monitors have been sweated on by who knows, it makes economical sense to just buy new. If you are doing some serious training, it is recommended to use one of these devices to ensure you are working out in your target heart range.
Because you are looking for accurate readings, buying a refurbished heart rate monitor will have some risks. When something like this doesn't work right off the start, or needs repairing, you may be faced with a lemon monitor forever. And besides, you can find some pretty funky models that have some great features when you buy new. So before you buy used, check out the new ones. Once you have seen them and realize they don't actually cost that much, you will likely be sold.