E2 grips are available from Sig, check questar. Mdcharlton is a distributar for Sig you may be able to order direct from them or through your local gun shop. There is a revision for the e2 grips on the mainspring and strut(don't quote me) that have to be installed to accommodate the grips.
An easier and better path for grips are the hogue g10 pirahnas in black. They're pretty much the best you can get, in my opinion. Mdcharlton is where I got my hogues, took 8 weeks. They do stock some as well.
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