I don't know of any rescue that will approve an adoption to someone who does not use heartworm preventatives. I would also hope a breeder would not sell a dog to someone who refused to protect their pups.
I strongly suggest you rethink this. Maybe some reading on the Heartworm Society's website might help:
American Heartworm Society
While there may be a lower risk where you live, there is still a risk....this link has a map of where there are cases of heartworms in the US:
American Heartworm Society | What Is Heartworm Disease?