The floral nursery
any flower shop can help you order, if this is a business venture use your eic# and order yourself, and depending on where you live it can be hard to get fresh cut directly from grower…lots of systems in place (middlemen) but if your order iis large or often repeated then you may find a grower to deliver/send direct.
Try Sam’s Club. We use lots of cut flowers in our B&B, and Sam’s delivers weekly at almost wholesale!