Rab (made in England) makes a single wall, eVent tent that's available in the states. I checked it out at the OR Show and was very impressed. It's called the Rab Summit Extreme and the price at around $499 seemed very reasonable as well. It didn't look particularly roomy however...the walls seemed to really angle in (no livable space) and the floor looked just big enough for two sleeping bags. It appeared to be a true mountaineering, peak assault-type tent.