I can sell you a sexed pair of Tarapotos, and slightly less reliably sexed pair of Varaderos. However, I think you should start with a tinctorius of one form or another - they are far more bold, they tame well and will beg for food from you, and adults are almost constantly out and about doing something right in full view. You can get sexed pairs (I just bought a sexed pair of Matecho) but they are usually pricey (at least $225, more if proven). I would suggest going through the
tinctorius morph guide and seeing if anything grabs your eye. The photos there are not the best but you can plug the morph names into a google search.