Zuzu - the roses that Costco sells could be classified as "milk carton" roses as that's exactly what they look like. Except the milk cartons from J&P have the bagged roses inside them. I really want a Black Magic.. I'm so jealous!
:)
But I've never seen roses that come in boxes that you plant! One local nursery here, Paulino's, sells their roses in those biodegradable pots (kinda like the starter pots you get when you start seeds.. Jiffy pots) that are like 3gal and they're a lot cheaper than the other nurseries. I'd be jumping for joy if they were only $20/ea!! Lucky...