Buying weighted balls

today im going to buy weighted balls. I want to know if anyone has bought weighted balls online or know a good site to buy them from. im looking for the one that brings 8 or 7 balls i think, with the exercises.

Many folks recommend using only 4oz, 5oz, and 6oz balls. If you want a set like this, you can get it at the NPA Website
. I don’t know how their price compares to other places.