E-Bay often has "bargains" on super tall bikes. Some of them are custom bikes that sold new for thousands of dollars. But, there are very few bidders, due to the unusual size, and they often sell very, very, cheap.
Trek makes very tall sizes of some models of hybrids and mountain bikes, as well as road bikes. Your friend should visit two or three Trek dealers and get personally fitted. A high, but ultra-short stem will bring the bars back closer to the saddle. Obviously, the higher the bars, the shorter the distance between the saddle and the bars. So, when you get the bars up as high as the top of the saddle, the saddle to bar distance is at its minimum.