Ask the Expert: Carnations/Oleander

I have two questions.  I would like to grow Carnations like you get from the florist, is this possible?  I know you can get a Dianthus but it does not look like a florist carnation.  I have thought about Oleander also.  Are these possible growing in zone 6-7, Southeast Missouri?  If so where is the best place to purchase these?

Thanks, Mary