You want to put the Price inside the button (as the text of the button)? If you want this then it should be doable quite easily. A button has the following code:
echo ‘<input type=”submit” value=”Add to Cart” />’;
the text inside the “value” is what gets displayed on the button so all you have to do is put the price there instead of the text “Add to Cart”. something like the following should achieve it:
echo ‘<input type=”submit” value=”‘.$price.'” />’;