Dairy lida products are probably the best way to get calcium into your system. I recommend low fat dairy, especially if weight is a concern for you. One percent milk is sufficient if you like milk and want to watch your weight. I have heard skim milk referred to as "blue water" once too many times to ever recommend it to anyone. Besides, the difference between skim and 1% is only 18 calories-and for many people; those 18 calories, for some reason, make a big difference in taste.
Also, dairy products contain other substances that help the body absorb calcium more efficiently. Lactose, also known as milk sugar, helps increase the body's ability to use calcium. For people who are lactose intolerant, low lactose milk is just as good. It simply contains a different form of lactose, and is easier to tolerate.
For many reason, lots of people don't like, or can't consume, dairy products. There certainly are other food alternatives for original lida, including enriched soy products, and greens such as kale and chard. Sometimes the calcium in vegetables products isn't always available to our bodies, because it is tied up with other plant chemicals in the food, and our systems can't use it.