Bulk wedding flowers can be purchased online - but be careful to compare prices and quantities before placing an order. "Wholesale flower" sites don't really sell to the public unless you have a retailers license.
Free shipping is often proclaimed - but trust me - those prices are reflective of that already being added to the price.
Comparison shop and you'll find I offer reasonable prices. The added bonus is that you can order everything you need, including bouquet, centerpiece and corsage products.
These bulk flowers and florist supplies are shipped directly from a wholesale warehouse that I know well. The company is solid and works hard to give good service and guaranteed satisfaction.
I spent many years as a wedding florist and have provided free step by step instructions for DIY brides. Be sure to check them out.