The best ones out there are from Neal Cooper in Kodiak Alaska. They come fully finished with automotive clear on them, and have a center core that is hard as nail to help with recoil on the bigger calibers and eliminates the need for aluminum pillars. The rear grip ones are $320, but not sure what they are for the factory center grip. Heres his info:
ncooper@gci.net
I just bought an older one from him that is painted and cleared with auto paint, but traded him my factory stock and trigger setup in the deal too(I changed it to a rear grip setup to use custom triggers).
Here's some pics of his work. Some are custom rear grip stocks, and some are painted factory stocks. They are all BIG calibers:
Heres the one I just bought off of him:
Sharp Shooter Supply will make you one for a Striker, but I dont know the price or if it is finished or not.
Another maker is Joel Russo, but I dont know his prices either. I belive they were $250-300 but not sure. Here's his email address:
jkrussos@comcast.net
Here's a great site for you to check out... Lots of Striker stuff on there.
http://specialtypistols.infopop.cc/eve/forums
You could always do a custom camo or paint job on yours if you dont wanna spend that kind of money. Pretty fun to do and if you mess it up just paint over it or sand it down and start over.
hope this helps,
mike