I got my retic at about 4in for $50 and my pair of motros cost me about $150 dollers in cichlids, over $100 in gas, and a $50 motel room since I had to drive to Wisconsin to get them. So about $300 for a 9in male and 12in female.
They cost more to feed though then they do to buy.
I got my motoro for $150 and just last night I got a nice looking histrix ($80) thats about 6in then a reticula that was about 3in for $23 and a 6in guyana ray for $40.