Kolaches in Fairfield or New Haven County?
Try Polonez Deli in Shelton on the River Road or Baltyk Deli on Main Street in Stratford. Give them a call. They tend to have very good purveyors and may even make them from scratch.
Also, might try Liscio's Meatland at Bridgeport/Stratford/Trumbull line; not sure, but they may be Slovak and often carry special items, especially during the holidays.