If you haven't done so already, maybe you should talk with your realtor first to see if it's worth the money to do the landscaping. If landscaping is recommended, I'm sure the realtor can recommend a landscaper.

Everything grows in Manoa. I agree you should ask your realtor. If they say that landscaping is worth the $$, start at Home Depot for inexpensive plants. You can also try Nii Nursery in Hawaii Kai. I also like Sharon's Plants in Waimanalo and Glenn's also in Waimanalo. These last 2 places also have larger sized plants.