Try Buchika's in Salem, NH (603-893-5534). I just bought a pair of this year's AC4s in 163 with piston there for $669.00. They had one more pair left, also in 163, as of yesterday. I didn't notice what sizes they had for AC3s, but I think they did have some in stock. There seemed to be quite a few pairs of AC3s around Killington when I was looking for the AC4s. Another place to try is Aspen East (802-422-3931), but they were more expensive than Buchika's for the AC4s.