I'm looking for the same thing, but with CL4 (CAS Latency of 4 ns) (if anybody knows where I can find this, message me too)
I've found one through Google Shopping that you might be interested in:
1x4GB, CL5, $65 http://www.newegg.com/Product/Product.aspx?Item=N82E16820220495
If you're willing to go CL6 or higher, you can probably find something cheaper.