I don't know about the pastry bags and stuff but they have a large selection of cake, cookie and candy supplies.
http://www.countrykitchensa.com/
I have two favorites.
www.thebakerskitchen.com
www.countrykitchensa.com
darkchocolate
In Australia I would have to say that www.blossomsugarart.com is fantastic! They ship out the order so fast! (i placed an order on thursday and i got it yesterday and i live on the otherside of oz to where they are) Products are great! Nice people to deal with. They have just started i think but every month they put new products on thier website and their monthly newsletter is full with information.
I havent tried or seen much online stores in america but i have also brought from the uk which is surbitonart.co.uk 
O.K. Canadians. Where are the best online shopping sites in the Great White North? I am in Ontario, but would be happy to know of other great sites in other provinces.
Golda's Kitchen in Toronto is very good. They might be a bit expensive compared to some, but they are fast (I've had my order before I got my confirmation that the order was sent) and their customer service is excellent.
www.goldaskitchen.com
I've also ordered from US sites, with good results, but you just have to watch the shipping charges. I usually ship by the cheapest method, usually USPS if I'm not in a hurry. You have to watch for extra costs, for example, UPS sometimes charges up to $30 extra from the US. But I've ordered from Country Kitchens, (great) and from Sweet Celebrations www.sweetc.com (great also - I've always talked to the same lady on the phone). With our dollar as strong as it is, it can be cheaper to order from the US.
Love country kitchen. I have bought from them for last 9 years.
I also like http://cakedeco.com/ . Lots to pick from, you will need to spend $50 but freight is great.
Quote by @%username% on %date%
%body%