Sprinkler nozzles

I am planning to build a small sprinkler system to use inside a temporary greenhouse similar to the system in one of the Holland videos.  Where can you get the sprinkler nozzles to use for this system. I can do the rest of the plumbing, but I haven't been successful finding the nozzles.  I live in Washington state and have checked a couple of nurseries and Home Depot. Can anyone help me out on this.
 
Rich Koch
Bremerton, Washington
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