I found these two which fit your size requirements - none are modular
FSP Group FSP450-60GHS(85)-R 450W Micro ATX12V 80 PLUS BRONZE Certified Active PFC Intel Core i3/i5/i7 Compatible Power Supplyhttp://www.newegg.com/Product/Product.aspx?Item=N82E16817104132
SILVERSTONE ST45SF 450W SFX12V 80 PLUS BRONZE Certified Active PFChttp://www.newegg.com/Product/Product.aspx?Item=N82E16817256063
There are a few others but I would not recommend them...
I personally like the FSP Group one because of experience with their units and good reviews when you find them