Don't know of anything in between those sizes. I've been using the IRC Roadlite 28mm tires initially on both the front and back but switched the back ones to the 37mm Primo Comet for loaded touring with the weight of my panniers on the rear rack. I second the recommendation for GreenGear as a source. Gaerlan is another option (used to be local for me but they've moved):
http://www.gaerlan.com/bikeparts/par...eel/wheel.html