I ordered 5 and they're about $15 a piece. I placed my order Tuesday. I know he is going to have some ready at the end of this month but I'm not sure how many he'll have.

If you talk to Larry, he'll tell you that you don't want to solve the problem quick. Instead, you want it to take about 6 months. By doing this you have a good chance at having some nudi's survive. If they mow through the aiptasia to fast, they never reach maturity, you have another outbreak and then you have to buy more. Sounds reasonable to me. Also, he told me this after I was trying to buy 10 so I decided to try out 5.

You may want to talk to him and see what he can do but if it were up to me, I'd try 2-3 and see what happens. I have a 175g tank which is why I'm going with 5. If in 2-3 months I don't notice any improvement, I may buy more. I doubt I'll have to do this after talking to Larry though.

One more thing, they are pretty small and nocturnal for the most part so I wouldn't plan on getting them out of your tank and giving them to someone else. I think you'd be hard pressed to find them.