Thanks for the suggestions. I will check those out and probably get something this week. To be clear, he has a D3100 and I want to get him a simple shoe-mount flash with controllable output. No TTL or anything fancy. I have insisted that he learn using everything on manual and I'm surprised how well he has picked it up. It seems that the LumoPro flashes are no longer available so I will have to find something comparable. I was tempted to just go the sync cord route, but these wireless syncs on ebay are almost cheaper. Thanks again.