I discovered that the pack containing Crash Bandicoot and Neo Cortex has become available for preorder on Australian EB Games website for $40. From previous experience I believe this equates to $35 usd. This means that its $10 usd cheaper,or $20 aud cheaper to get the Crash Bandicoot starter pack than a regular starter pack and the Thumping Wumpa Isles pack, however it's even better value to just get the dark edition starter pack and then separately get the TWI, if you're not interested in having regular and dark characters or having the game on 2 consoles.
This is useful information as I don't believe we knew the TWI pack's price previously.