Hero Tavern

Hero Tavern

I need help!!!!
Just made a new map and I've added a few special heros in the hero's tavern. I want to stop the new hero's to be purchased more than once!!
How can I do this...????

1: Bad account name
2: Stupid question that can be answered in the correct forum
3: Answer: In Map Initialization, put this action
Player Group- Pick every player in (All Players) and do Action: Player- Limit training of (hero type) to 1 for Picked Player