I’m shopping around now for some whistles (looking at getting a set of nickel Generations, and maybe an Original unpainted Clark), and so far it seems to me that The Whistle Shop is the cheapest.
Where are your favorite places to shop online and why? I want to make sure I’m getitng the best deal before placing an order. 
the whistle shop is the best to get the Gen set and other great prices. i also like ebay. 
I like to do business with “Doc,” at the Irish Flute Store. He’s fair, honest, quick on his feet, helpful, and he sold me the Single Best Irish Whistle Ever Made…a used Bernard Overton Low Eb. (I said I was looking for just such a whistle…and…phhhht…he came UP with it!) (I know…LUCK…) (or IS IT?)
He also carries professionally modified “cheapies.” A good whistle, that you love to play, is worth it’s price.
Happy Hunting.
If I wanted a full set of Generations I wouldn’t consider anything but a full set tweaked by our own Jerry Freeman (otherwise you’ll just be cussing at half of them). Send him an email. He’s as nice a guy as there is in the world. 
Doc
That would be really nice… if I could afford it. 
A Jerry-tweaked C/D set will turn your head around. It’s not that expensive, and you’ll never look back!
Yeah, there ya go. And if there’s some other key you can’t live without just save your pennies and get them one at a time.
In my experience untweaked Generations are great for holding windows open.
Doc
You…you…heathen!
Did I not say that the Doc was fast on his feet???!!!
And speaking of Jerry, (I’m still on-topic. It’s our favorite online place to shop!), where’s he been of late? I see him on eBay, but not on the boards. I hope all’s well, and he’s working hard on that new production model he mentioned a few months ago!!
I like Elderly Instruments www.elderly.com if I’m not buying directly from the maker.
Angelo
And he can’t play ANY music without an Irish ornament or 10 either!! 
Used them three time now and happy all the way !
Bought one whistle from Doc Jones and also very pleased !
I’m a “Doc” guy.
…john
I’ve bought whistles and other stuff from “Song Of The Sea” in Maine. They are very good and honest people and it’s a pleasure to buy from them.
I also dealt with other shops where I found almost always helpful people, but if you ask me who is the n° 1 I have to tell Doc Jones at the Irish Flute Store: in my opinion his costumer service is unbeatable.
I usually use The Whistle Shop (which is usually the cheapest) or the great folks at Whistle & Drum, who are just all-around wonderful people.
I’ve placed orders with thewhistleshop.com, whistleanddrum.com, and lollysmith.com. Never had any problems and would recommend each and every one of them.