Anyone know where to find keyhole limpets?

Looking for keyhole limpets to control hydroids. No-one seemed to have any idea how to kill/ control these on the thread, so I'm going to experiment on my own. I am going to try a combination of KL and peppermint shrimp along with manual removal and nutrient control. If anyone knows where to find the limpets for cheapest please let me know.
 
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