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You can do your own Monte Carlo simulation with a bit of coding. From memory:-
On your own you'll likely spend ~£450 to do it if you don't swap at all.
With 20 of you to swap between then it's about £90.With the Internet you can do it pretty much for £68 and a load of 1st class stamps and envelopes. Gumtree search for "panini swap by post".
Greenbank
It was a simulator http://codehesive.com/worldcupstickers