I'm selling the battle pack for €29,99 euro.. But as the dollar is so low it might just be 40 dollar again hehe...

But I think you have 2 options: either wait for the new expansion, wich might see a price drop for the other packs ... Or start with classes that don't really need TBC from start(I just got 2 TBC accounts, and 3 normal ones). That way you can always buy it when getting near 60.