I got my cp's (and all florals) from Sue Gallo - www.suegallodesigns.com The pic of the mock up she did is in my bio.
I *believe* she is charging me $40 - $45 each, which I think is reasonable. If you want fresh florals that are set up for you, you would be looking at $30-$50. personally, I think it's worth the
expense...you don't want to be running around the hour before your wedding setting up cp's...it would be nice to spend that time with your fam and bm's, kwim? You should just be relaxing and enjoying your day! And realistically, by the time you
bought the roses and vases you would be looking at $25 (at least)...if let's say a florist charged you $35 to set them up and provide them to you, you would be saving $10 per table - or $100 if you had 10 tables - totally worth the stress saver!!!
If you just wanted something real simple - ie. a dozen roses in a vase w/ some votives, I think Old Mill would be able to handle it...but if you want anything more elaborate, I would get it done for you.