Try this, go into the Samsung GS3, choose one there and click add to cart, and when the pop up shows up, press new customer. Put in your zip, and press buy device with new service. When the phone menu comes up, under the select device header, press ALL DEVICES, then choose the phone you want. Choose the phone you want, and when you click through, it should let you choose between the new and old plans...
This method takes you into the old Verizon ordering system, so can't guarantee it will work, but its the only shot you have I am afraid.