THINK BEFORE YOU ORDER!
Here is what happened to my purchases.
I followed the links and purchased from two suppliers, it costed me total of $20 including shipping.
The first one sells the Ghost Sim Card, from the very first post of this thread. I was able to purchase it from their ebay store (red_ferrari_f355) here :
eBay: Blackberry 8700c, R957, R957M Ghost Dual SIM (item 110018998809 end time Aug-18-06 11:57:00 PDT)
I bought it on Aug 12, and I haven't received any message saying it's shipped, and no product arrived. So I sent the seller a message today.
My second purchase is the Dual Sim Card King, here is the link I purchased from gezeng:
eBay: Dual sim card-no Cutting-no power off-number displayed (item 330017232389 end time Aug-18-06 19:39:45 PDT)
I received it today from China, fast shipping. I managed to make it fit into BB8700, but it does not work. Looks like there is no connection at all because BB says "Insert the Sim Card" no matter what I do. I am pretty sure I installed it right because I called this seller in China using skype and spoke with him in Chinese, and he just told me to re-try and press it hard, etc. When I called again, he switched offline. So no further response. I sent a request for refund. This looks promising, but I am very doubtful it's going to work, because by design, you need to fold that piece of product, and I think the folding will sooner or later break the wire inside, if not immediately.
So here is my experience. Think before you order.
Unless someone on this board took the picture of their BB and showed to you it actually worked on their BB - the setup, and menu on screen, do NOT buy it. Save your time and money.