That's the same species as shown in the completely false video BBC or natgeo.. whichever made on youtube. The one that spred rumors that they'll shoot your finger off.
Meeh... they're not that difficult to get a hold of. They're uncommon but not a rare thing to obtain when searching. They retail cheaper than most of the regular pistols actually.
Reefs2go and Thatpetplace are two places who have them listed. Both only $9.99 and one place has them instock! (TPP)
That species, like I said will host anemones and their main in the wild is curly cue anemones (actually one of my favorite nems! Very easy to keep, don't need overkill lighting.. picture an oversized aiptasia that don't reproduce) but I forgot to point out they do not pair with gobies if you ever plan on trying that.
Also I agree, mixing pistols in a 10g is asking for an ol' cowboy showdown over the pretty fish.