yeah wambaugh's, I have a Illinois State Jacket from them. It is really amazing jacket. It was enough to convince me to start saving up for a proper sack coat from Wambaugh's.
However I know Chris Daley makes also high quality sack coat for 160. But he has a repuation for being so slow. If you're lucky, you probably can get his stuff at sutler row in some events but one of my friend ordered a coat in March 2012, and he finally got it in March 2013.
Jeez I have never seen a sack coat go that high.
Bear in mind, im only mentioning the high quality stuff, some are Museum Quality too. However there are still some good sack coat out there with proper quality that can go high as 75 to 150.