I'm not aware of one but I hear prices can vary quite a bit. If you choose to use a ADA dentist, you migth want to do fewer at one time and take very generous amounts of antioxidants--vitamin C, E, selenium, some NAC and related supplements, etc. That is what I did.
I also suggest that you mention to the ADA dentist that you'll want an xray of the teeth to confirm that there is no remaining amalgam. Mention that Before the dentist starts. They might not be so fussy about getting all of it. However there have been plenty of reports in detox groups from people who had nasty side effects while chelating with small amounts of Amalgam remaining. I know it seems unlikely but the number of reports is compelling.