Try your state forestry dep't - they frequently have nurseries where you can buy trees in bulk - 25-50 are usual MINIMUM purchases. Look under state departments on-line - whichever one has to do with trees should be able to lead you to the correct linkage. If it doesn't work easily, try if your extension agent can give you an easier link.

The trees you will get are pretty small, 1-3 years old, but the price is usually a couple of dollars apiece, or less. The more you get, the lower the individual prices.

Checking to see if my post made it, I re-read your initial posting more carefully.

Most of the eucalyptus species are reasonably invasive in CA, although they may not be classified as such in your area. More to the point, they are VERY flammable and shouldn't be planted close to houses, nor at all in areas prone to wild-fires. In addition (you want more reasons not to plant them...?) they are allelopathic - that is, the leaves, the shed bark, roots, etc., give off chemicals that limit the growth of other plants under them - so little or nothing will grow well under them. They may be pretty, and I admit to admiring them when I lived in the Bay Area, but I would pass on planting them, either from seed or as grown plants from a nursery.

Your state department of forestry is a good first choice. I've had good luck with small orders from Musser Forests in quanties up to five. They also have a decent selection of slightly unusual or accent plants.

Here is a link that might be useful: Musser Forests

I agree the Forestry Dept. is a great suggestion. I would also shop around your nurseries to see who carries bare root shade and ornamentals, cheap and cheerful!

Good luck!

Has anyone tried this company...Cold Stream Farm ?

Here is a link that might be useful: cold stream farm