Black roses are really very dark burgundy roses, often characterized by blackened edges on the petals. Different varieties include Black Magic and Black Baccara.
Take care in choosing where to purchase your bulk flowers. Many wholesale farms insist you purchase large amounts of stems - yet still charge an inflated price. It's rare for you to get true wholesale price unless you have a retailer's license.
My goal is for DIY brides to actually save money by buying everything they need for their wedding flowers in one place. I allow brides to buy one bunch at a time or larger quantities for a discount. This gives more freedom of selecting different varieties of greenery and flowers.
My store includes the florist supplies you need to design your own flowers. This includes items such as bouquet holders, centerpiece supplies and the proper flower tools.