我应该如何向用户提供成本字段，并将其存储在数据库中？

Right now I have two fields for cost. One for dollars and one for cents. This works, but it is a bit ugly. It also doesn't allow the user to enter the term "free" or "no cost" if they want. But if I only have one field, I might have to make my parser a bit smarter. What do you think?Right now I have two fields for cost. One for d