I would love to help you. While I don't personally know anyone, I can recommend that you contact the people who oversee the Oregon Medical Marijuana Program. Here is a link to their page, where it also includes a phone number: http://public.health.oregon.gov/PHD/OCHHP/OMMP/Pages/contact_us.aspx
They can probably recommend a source that you can trust. Please let me know how it goes. If they can't help, we can always try something else.
The American Cancer Society may have some suggestions, and they can be contacted at the number listed at the right and bottom of this page.
Also, if you haven't done so already, consider posting this in our Questions section. Somebody may have an idea.