Tier one: 10/15
Tier Two: 300/450
Tier Three: 1000/1500 (Mini & Blob)
That said, they weren't going to be setting the price until release, so it might be lower. (or possibly higher)
I'd be happier with costs at tier two being 100/150 and maybe if they want Tier three to be rare, 250/375
As it is, very few of my characters will bother even though I want to. (Looks like for my timeline, I'll get my badger enough in six weeks with my playstyle.
I know the Tier Three are supposed to be "Oh Wow", but I'll be going "Oh Wow, that was a long grind"
Feedback thread with Cobolt's responses noted: