Hi,
How to make the price column read only
You can make any column readonly by using 
grid.attachEvent(“onEditCell”, function(stage,id,ind){
    if (ind == INDEX) return false;
    return true;
});
where INDEX - index of column which need to be set readonly. 
Also , you can change column editability through prototype , as
eXcell_price.prototype…isDisabled=function(){return false;}