Where can I get edge pieces for my granite counters?

My husband and I are thinking about purchasing premade granite slabs for our kitchen counters. The slabs are bull-nosed on 2 sides once on the long side and on either the right or left. The problem is, we want to use the slab on a peninsula so we need to bull-nose the 3rd side, but the slab is only 24inches wide and if we bull-nose the third side, it will be too narrow for the counter width. We heard that you can buy granite edge pieces that just attach to the existing granite and are already beveled. Where can we get those and how much do they cost