You can ask your jeweller to make one for you. Necklaces like the one on your picture is now quite common. As for the price, it would depend on the "materials" you would use. My necklace with my name on it cost me a good sum, since it's white gold with some rocks. The price would spike up if it were made of platinum and some rocks.
As for silver jewelry of this type, you can ask Unisilver or Silverworks. I had a simple bracelet made with my name on it. Cost me less than 5K.
if u want na mejo cheap... sa silverworks sa mga malls... mga 300++ lang ata... additional na lang per letter pag lumagpas ng 3 or 4 letters yung name...