its only about 20 dollars go to a menards or Home Depot and buy the right size wax ring
depending on your area, $80.00 on up.
The name for the wax seal for a toilet is a wax toilet ring. Some people also call this item a toilet wax bowl gasket.
You may need to replace the wax seal under the toilet. It isn't difficult to do, but will take a lot of time.
Where is it leaking ? Flapper in the tank, replace flapper. Between tank and bowl, separate and replace the seal. Toilet to floor. Replace the wax ring under the toilet, making sure it is thick enough to form a seal and the bolts are installed correctly and holding the toilet down.
Most likely you have to replace the wax seal. You can do this by going to the hardware store and buying a wax seal in the plumbing department. Next, you turn off the water to the toilet ( empty it by flushing it AFTER you have the water off). Now, you unscrew the screws on the base of the toilet, next you lift the toilet off . Now, you will see the old wax seal. Remove it. Put the new one on. Replace the toilet, redo the screws, start the water back. You should be ready to go. You can also call a plumber in to do it for a 60.00 service call and his labor would probably cost you a 100.00 to 150.00. I know all of this because I have replaced 3 wax seals.
Wax ring is leaking. Wasn't thick enough to begin with, bolts were not tightened down enough, bolts broke or rusted off, flange the bolts hook into broke, floor rotted from another leak and let the toilet rock and break the seal on the wax ring. Could be any one of these or two combined.
The wax ring is just to seal the toilet to the drain. It has no effect on the flushing.
You may need to replace the wax seal under the toilet.
If it's leaking between the toilet and the floor, you put the wax ring in wrong. If it's leaking between the toilet and the tank, you need to replace the gasket.
With a deep floor flange Or a wax seal with a horn and extra long Brass floor flange bolts
Do not use silicone at the base of the toilet after seating the wax ring. You must use grout. The rocking of the toilet will wear the wax ring seal.
You can find detailed instructions for replacing the wax ring under your toilet at http://www.hammerzone.com/archives/bath/fixt_repair/toilet/wax_ring/replace.htm. It should cost around $20.00 to complete this job.