Probably the best place would be from steeda themself. If I am not mistaken, they even have them on special right now for around $150. Great shifter...you'll love it and easy to install too, plus if you have any trouble...steeda has very good customer service. My only other suggestion is to go with the MGW shifter handle...its adjustable and much more comfortable and it only runs about 30. Hope this helps!
I got mine from thunderbolt motorsports, they sell on Ebay, but I dealt with them directly. If you can get new ones from Steeda for $150 tho, I would probably go with that also.
Great shifter, you'll love it.
Sorta off topic, but has anyone ever had to retighten their shifter handle bolts? I just found out mine are loose. Oh well, had to take the boot off anyway, got a polishedbillet shifter bezel going in.