? E.Coli competent greater than 10 +E 8 without electroporation

[reber at uni-bonn.de]

Dear All,

I'm searching a method to reach high competent E.Coli without electroporation.
I need the method for a biological assay, so that a great amount of E.Coli 
should have the same max frequency of transformation.
I tried allready the Maniatis-method for high competent cells with the 
Stratagene clones Ag-1 and SCS-1, but I reached only a max frequency of 
transformation  4 x 10E 7.
Maybe you have some hints or some different methods.
Please mail to reber at uni-bonn.de or post an answer

Thanks Michael Reber