I would not graft apple on to pear trees because they are known to have problems. They may grow several years that way and I've been told they eventually die.

Are you looking for someone to graft apple and pear trees for you? If so, try contacting your local extension office. If you have only a few you want grafted, learn to graft yourself. You'll be glad you did. It's not hard and you don't have to buy special equipment; apples and pears are the easiest trees to successfully graft. You can check out numerous videos on you tube for instructions.