Probably a solid three inches I imagine. The store I got it at is notorious for two things though 1) rare specimens 2) horrible conditions, so one has to be careful, but I could not pass this one up. I got to bag it myself even - that's how they do it - even with poisonous fishes! They had sharks, many eel species (including greens and giants), football sized angler, jellyfish, and just plain odd things I had never seen before.
But, yes mantis shrimp are circumtropical and not rare. Some species are however, and some don't ship well at all - so getting a nice specimen is not always easy I don't think.
btw, I also got a 2.5-3" clown tang for $9, and it died the next day (this morning), so I have mixed feeling with that store (hate, guilt, and a twisted fascination with their rare stuff).:notsure: So I go in there about once a year (this was my third trip in three years and it's only 50 min. away...)
INNSMOUTH - what happed to your peacock, did it die or did you just get rid of it?