I think there is a slight upcharge for silks. I had a larger bouquet than the standard Escape package, so there was an upcharge for that as well. I think the boutineers were like $2.00 more or something like that. Nothing major, but well worth it, because I will always have my bouquet, looking just as beautiful as the day we said "I do" and it didn't cost $500 + for preservation !! I think part of the reason for the upcharge is that I am sure Disney grows many of it's own flowers, so to purchase the silks is more costly for them. Like I said though, it isn't a big difference financially and you don't have to worry about wilting, colors, etc...it gives you so much more freedom.