HERBAL CHOICE CAREGIVERS in kent/tukwilla business district. AMAZING meds, can be pricey for some individuals, but like all the finer things in life, you get what you pay for. Their BHO is amazing too if you are in to that.
Seattle Cannabis Co-op is another good one. I vend there quite a bit, and I always notice great meds right along with what I'm bringing them.
Dockside Co-op on 136th? is awesome. They have some of the BEST buds in all of the state in my opinion. Been there a few times, every time they had straight KILLER MEDS!