I agree that ingredients are more important than the price. I'm not sure if pure hyaluronic acid will work though. In order for hyaluronic acid to hydrate skin and diminish fine wrinkles, it has to get through the top layers of skin. So the hyaluronic acid has to be processed in a way that breaks up the molecules and allows them to permeate into skin cells.
You can't know if a product has been processed that way or not. So the best way to shop for a hyaluronic acid cream is to read reviews and pick one with great reviews.