How can you find a lab to test dog food that you suspect is tainted?

contact the ASPCA they should take it from there, or give you info I checked out their website and they charge $60 just to make a phone inquiry. I don't mind paying for the analysis but I think $60 is a bit steep just to find out how to go about it. They don't have any way of e-mailing or getting past the voice prompts to pay the $60. Any other ideas?