Share 'Does anyone know how to straighten out a wobbly disc?'

Two of my discs have developed a wobble. It's probably from heat as I keep my bag in the trunk of my car. What ever the cause my Buzzz and MRV both wobble now and they didn't used to do that. It is any throw, even spinning them up a few feet. Any suggestions on straightening them out? Or, am I going to have to buy replacements?