Hi Mel!
I'm in Winnipeg too! You can find some Splenda sweetened drinks at Costco... I go to the one in St James, and a friend of mine said that she couldn't find them on Regent, so I'm not sure if they have them or not.
They're called "Sparkling Ice" and are made by Talking Rain. The pack has four flavours, Black Raspberry, Harvest Peach, Pink Grapefruit and Orange Mango. They are sparkling water beverage, so they are like fruity pop, not like fruitopia or something.
Other than that, I usually keep a pitcher of homemade iced tea, made with decaf tea or herbal tea and sweetened with Splenda.
I'm heading down to Minneapolis in January, planning to try to find some diet rite and all sorts of other lc treats when I'm there....
Feel free to pop by my journal, us Peggers need to stick together!