Sternfeldi are very hard to sex, especially when they're this young. Males will have a thicker tail base and spikes will extend further down their tail. The females spikes generally end at the tail base. CarlC is experienced with sexing these guys but without a photo of them walking with their tail extended it's really hard to tell. I sold my babies between $100-$150, although they're captive bred. These little guys probably are too