What is the cost to replace a garbage disposal?

It all depends on the brand, horse power, voltage (be it 220 or 110), warranty, and if you will do it yourself or if you will hire a plumber. Each disposal brings detailed instructions to remove the old one and to install a new one. If you are the kind of person that likes doing stuff around the house and you are not scared to take this on, it's a relatively easy task.

Look under your sink and check the horse power and voltage on the disposal. To make things easy for you, it's best to replace with a similar one. If, for example, the one you have installed right now is a 1/3 horse power and 110 volts you don't want to add one that is 220 volts and 1 hp because you might need to upgrade the wiring that is already in place. This in turn is more work and you might need to hire and electrician for this task.

You can order your disposal from this website, or go at your local Home Depot or Lowes to purchase one.

http://www.homedepot.com/webapp/wcs/stores/servlet/Search?keyword=garb age%2Bdisposal&langId=-1&storeId=10051&catalogId=10053