Do you still have roses blooming in your garden now and have a lovely bud that is showing colour but hasn't started to open yet? Then you might want to try something that my Mother used to do each year (although I think she probably did it in the summer months). Simply pick and freeze them.
My Mother used to put the roses into plastic containers and put them into the deep freeze. She used to take them out to thaw on Christmas Eve and we had garden roses on the table on Christmas Day. I admit that I've never tried this myself, having access to a fresh supply of roses from our farms, but I think it's worth a try. Let me know how it goes!