Not sure how good they are but you might try these links for a source. http://www.cnplx.info/nplx/species?taxon=Arbutus+menziesii http://www.botanicalgarden.ubc.ca/forums/showpost.php?p=59346&postcount=5
I found this page which lists a few native seed sources you could try contacting, http://www.npsbc.org/Use/use.htm
Hi I get seeds from Van Dusen Seed Collectors http://www.plantexplorers.com/vandusen/ Pricing with postage is very reasonable. Michael -arbutus in pei-
They grow wild all over my property and the fruits (and seed) are likely to be ready in a month or more. You can PM me if you'd like some fresh Vancouver Island seeds. Cheers, LPN.