Another option is to have it done in silk or try and dry them yourself using Silica. Keepsake floral is very pricey, and I do not think you can get your money back if you decide at the last minute not to do it. Also, I think the average expenditure for people that I have heard from has been around 700-900 dollars.
here is a link of one of the disney brides that used keepsake floral and was very unhappy with them- just so you have some info. I am not sure if it just happened to her or if it has happend to other brides, or if they have corrected the issues. http://www.disboards.com/showthread.php?t=1010035&highlight=keepsake+floral