I just bought my second hand from someone for $50 mine has the gel so it tells me the heart beat aswell
You can buy a basic one at toys r us and Wal-Mart here in Canada there only $30 or you can get a high end one with jelly and tells you fetal heart rate ect at any medical store they go for about $100 ++ they basic ones just have headphones and no need to buy the jelly
where can u get them from