When you want to buy a cheap cooker obviously you have to compromise on some the requirements you need to have in a cooker. So you have to first decide on the features available and the featured you need before selecting a rice cooker. A best place to start is Amazon.com or next tag where you can get detailed description of the features in different rice cooker brands. Once you decide on a rice cooker then you have to explore on the internet to find the right deal.
Panasonic SR-G10G is one good rice cooker that is available at a decent price. It is available at 21$ as of today. This is a 51/2 cup rice cooker that is decent enough for any family. It also comes with measuring cup that can be used to measure the rice when you cook. Another good feature is the warm option. As soon as the rice is well cooked it can switch to warm mode easily. This helps in serving hot rice as many people does not like cold rice very much. This does not have a Teflon surface which is good in a way.
Other than the Panasonic one stated above , there are many asian cookers that are available for cheap prices. Infact I have seen some cookers as low as 14$. But you have to check the reviews/ratings before you decide to buy one.