Disney Floral does have a website...but it's not what you are looking for. It's regular florist type stuff, nothing really for weddings and not much info, IMO.
I have just spoken with Rosie at Disney Event's and she told me lei's are $35 each...and yes, you can get them through Disney floral for your wedding. DH2B and I are both wearing lei's and I have asked her to get me a price on the haku lei (the floral headpiece brides wear). But I haven't decided if I'm going to go through Disney or not for the lei's. I've found several websites that sell silk leis for about the same price...but they'll last forever. Just something to think about.
It sounds like you are doing a Hawaiian theme for your wedding as well...is your dress going to be Hawaiian style too?