These seeds are good ones, but they are also in demand. Later this fall various clubs will be having seed auctions, you may be able to get them at auction.
There are many other good seeds out there that will grow you some very big pumpkins... ask on the seed exchange forum on this site. I am also emailing you.
Have you also tried to contact a grower called Medhi? He is a french grower and grown very large pumpkins.