Tender roses? Roses? What?

Hi. I live in central Canada, and I would like to plant some roses. I would like to overwinter a tender variety. I have called some greenhouses asking if they carry the type of rose that I want, but none of them seem to have it. The type of roses I want are called "Tender roses" I beleive. You know the kind that you buy in a florist? They are the ones in the picture and most of the times I've seen them they've come in a bouquet:
http://www.australianflowers.net/ima...ora/AUS305.jpg
Anyways, I was wondering if I could plant those. But, every time I call a florist and ask for tender roses, they just say "Tender roses?...uh...no...we don't have those...". They always sound really confused at my question, so I was wondering if there was another name for them or something. Do they grow in a rosebush like other flowers, or do you just plant them in the ground? Also, are they expensive?
I prefer the white and pink varietys.
Any help would be greatly appreciated!

Here is one link about growing tender roses in Canada. If you search google or something like that, there are lots of links. I don't think these are like what are sold in florists, though. They are bushy roses that usually only grow for one season - also called tea roses.