Raul,
I have 3 A. trifasciatas but I THINK they're all females (80% sure). However, I know one lady in San Diego that has A. tri for sale (males and females). I was thinking of driving down there and pick up two males or so, but haven't had a chance (midterms are kicking my a&&). If you're really interested, let me know, we can plan a road trip.