I'll start with a disclaimer. While I do think I am one of the most experienced bravery breeders, I usually do not buy and sell broods. But I'll give you my best guess.

So I think there are 2 answers to your question. What would I, as one of the most experienced and established bravery breeders on HEE would pay. And what I suspect other people might pay.

My experience has taught me to not put too much hope on any one single bravery match. The RF is just too wide. In my opinion, it's better to cultivate a large broodmare herd with depth. With that in mind, I probably would never be willing to pay more than 40k for a top BABLB brood. I've seen too many top ranked mares produce crap and bottom LB mares produce well. However, not everyone knows this or agrees with this. I have seen other people pay 100k for top BABLB broods, especially if they are new to bravery and approaching it like they approach AD, where it is better to have just a few good mares.

As for sale price... I would guess somewhere between 100k-200k. 100k is what I might be willing to pay, but I would guess that other people would be willing to pay closer to 200k. Maybe even 300k. Sale price is harder for me to guess because I can't remember off the top of my head seeing a top mare sold, like I have seen them be brooded.

I hope that helped. :)