Cost of gall bladder stone operation varies in every hospitals or nursing homes. I can only advice you that open cholecystectomy,even if economical, has various complications post operatively compared to laparoscopic cholecystectomy,which is a bit more expensive. So, at the end of all, it is your decision. Think before accepting any operation. Consult with your coultant surgeon about this matter too. Surgeon or adminstration of any hospital or nursing home can give you clear estimate.