Hi!
It really seems like the FPCB (Flexible PCB) SIM card adapters have been removed from the rebelsimcard.com store. A couple of months ago, you could buy them separately from their "Hex Scanner".
I have sent them an inquiry indicating my interest in buying bulk quantities (100 pieces). Let's see if that works. IF not, we may have to develop a 'plan B' in this area :(
Regards, Harald