Here are a couple of places you can find your own Sideways Cross Necklace:
• Online jewelry shops – This style of pendant is becoming trendier each day. Most Online jewelers have a variety of different crosses in different colors. These online shops are also the perfect place to go if you want to customize your own sideways cross pendant. They can size it with the dimensions you like.
• Department stores – Most department stores have their own jewelry sections and you will surely find a sideways cross pendant there.
• Vintage and antique stores – These stores do not just sell old lampshades but they may also have old jewelry boxes with vintage jewelries inside. Sideway crosses are popular today but they have been used for many years already. If you are lucky, you will be able to find a vintage one with original renaissance designs.
I found a seller on etsy selling the cross necklace.