If the stethoscope is under-priced for what it should cost and if you are getting an enormous amount of discount, it’s probably a fake one. A Littmann sethoscope price can be found in the official site and generally costs you around 5000-6000Php (80-100 dollars)some variants are cheaper and there are expensive variants specially cardio IV, master cardiology etc. Try to have an estimate of what it costs before buying.