If the source is not a connection from above then your disposal needs to be replaced. Try cupping your hands around the very top under the sink while running water. The ring that seals the gasket turns clockwise to tighten. The only other repairable leak would be where the piping comes out the side. There can also be a smaller dishwasher drain hose above that.
The company Waited hired has an “A plus” rating with the Better Business Bureau and has been in business for 14 years. They didn’t do anything wrong, so CBS4 is not naming them. They didn’t want to discuss the charges. They stand behind their billing, but they didn’t like having a customer who was unsatisfied. The company agreed to refund $400 to Waite.

Reattach the electrical wires. Unscrew the faceplate on the underside of the new unit. Match the colored wires on the power supply to those in the disposal’s electric housing and connect them using plastic wire nuts. Slip the copper grounding wire over the green screw at the far edge of the compartment. Replace the cover and tighten the screws.[16]

Manufactured in the United States, Waste King garbage disposals have won much praise for their energy efficient design. Waste King offers a wide range of garbage disposers for both residential and commercial settings. In the early 2000s, Waste King refocused their sights on providing unparalleled customer service and quality products, and their warranties are the current industry standard that others are measured by.

Flush with water. Simply flushing out the garbage disposal with water will help to remove any loose dirt or grime. Stopper the garbage disposal, add a squirt of dish soap and run the hot water until there is 2 to 4 inches (5.1 to 10.2 cm) sitting in the sink. Pull out the plug and turn on the garbage disposal, allowing the water to flush through.[2]
The General Electric 1/3 Horsepower Continuous Feed is a relatively small unit. One of the most important measurements with garbage disposals is the size of the grind chamber. In this case, it’s 26.5 ounces. Power, at 1/3 horsepower, is at the lower end of the scale, but this is a light-duty machine. The owners we surveyed were very happy with the General Electric’s performance.
Your garbage disposal gasket is the top rim where the rubber seal mounts to the flange.  If your disposer is leaking from this area, the cause could be a leaky gasket.  Gasket leaks can have several causes: ageing gaskets can develop leaks; long periods of disuse can dry the gasket and cause it to leak; if your garbage disposal was removed and then replaced, the gasket may have been improperly sealed; if the gasket is not locked evenly on all three sides, it will leak.
Some folks knocked the instructions. Take heart. It appears that the Waste King guys have heard the criticisms from the negative reviewers. I am guessing that they have been re-written to better explain the installation because they are really easy to follow. My best advice is this: don't be afraid of a difficult or confounding set of installation instructions. It is really easy. Here's what you do. Go to youtube.com and search for a video on How To Remove Your Existing Garbage Disposal because this is the hardest part. You will find one that matches yours. Watch it. I started removing the Badger incorrectly, stopped, watched a video, and then it was a piece of cake. In my case, I shouldn't have removed the three long screws before removing the body of the old one. You do it after it is disconnected. READ the instruction manual carefully. Then go ahead and youtube the Waste King installation video. It is very easy once you see it done. No filing or grinding gaskets, and Good Lord, no car jacks under your sink please. If it is hard then you are doing something wrong. STOP!!! Review the procedure. Start again. The directions are actually very explicit. The parts are well labeled. The diagrams show you what to do. The videos show you what to do. If you prepare yourself (15 minutes of reading and watching videos, tops) you will fly though the installation and be a happy person.

Garbage Disposal Repair