which kind of internet connection are you on ?

I can make you an iso of the wotlk install media on the day, and fix you an ftp you can download it from (provided there is no downloadlink on Blizz).

Perhaps contact customer support - blizzard store as a feature, where if you add your cd-keys to your blizzard account, you can download media to the cd-keys from there.

PM me, if the blizzard thing doesn't work out, and I'll hook you up. (I have 25mbit upstream, so less than an hour if you can max it for a full dvd)