The internet has everything you could ever need and more.
Unless you don't like paying for shipping or something like that, one of the best places to get stones is
www.theperfectedge.com . The owner is a member here and will get you set up with some great stones.
Other than that, there are some good items in the buy/sell/trade area of this site:
Strops & Hones - Straight Razor Place Classifieds
Cheers!