I thought most scopes you can reset where the parallax zero is. Call the maker and ask them how.
You may not need to buy anything new.
ETA- If you're quite consistent with your eye location behind the scope you may not even need to bother. I have old tasco 3-9x44's on some of my rimfires and never reset anything and get good accuracy. If you have a poorly fitting stock where you have to hunt around for your eye location then you will likely see some issues. One way to check is to bag your rifle on the bench on a target. Move your eye around the rear of the scope without disturbing the rifle at all and see how much the cross hairs travel from the target center. That's your parallax error potential. A bad position and you move your eye location out of your norm and you move your impact off target.