I've just noticed that the versions of these resources in the Platinum Bundle seem to be different from the ones I bought in the 29 volume SESB bundle, so they don't qualify for a dynamic pricing discount.
It wouldn't necessarily make a huge dent to the overall price for me, but it's a little depressing as it was part of my justification for buying the bundle. I should have done more homework!
Can anyone tell me what I'm missing out on/why they're sold separately?