Well my seemingly impossible-to-control impulse buying has kicked in again, and I've just pre-ordered a case from CollectAndSave.com
While they weren't prepared to fudge the value on the shipping costs, they did agree to split the order into two shipments of four boxes each, so the value would be well under.
All up I've paid USD$1109 including shipping.
An expensive set, to be sure. Hopefully it will hold its value.
Also if Topps stop flooding the market with Series 4, then maybe both sets might be worth something.