There really isn't any blue rose. Even the mauves/purples tend to the red side not the blue. There are many that have "blue" in their names but none that I can think of that are more blue than red. Soil and weather conditions can have a big effect on the color too. So what might be more purple in one yard may be more pink in another. Have a look at Help Me Find and see if any of them appeal to you.

Here is a link that might be useful: HMF

I think Twilight Zone fits the definition of bluish purple. It's not reddish. I'm sure it's available somewhere in Canada, possibly even locally for you, since it's a popular rose right now. A bluish lavender rose is Blue Bayou, which, at this point, is pretty hard to get. Here's a pic of Twilight Zone. Diane

The two darker purple roses with the "bluest" tones are Blue for You, which is only available right now from Chamblee's Roses, and Rhapsody in Blue, which is more readily available. Greenheart has Blue for You in production to be sold to growers who will then grow on the plugs to retail size plants. I'd think you should then find it in big box stores and perhaps other nurseries. Both of these can give you some pretty "blue" tones. The alternatives are newer lavender roses such as Novalis (Poseidon) and Blue Bayou which appear to be pretty much sold out from most sources from what I've seen. Kim