A sales clerk says, "A bromin potion will cost 41472 Duskruin Arena bloodscrip to purchase. There are only 16 left!"
On the best days I believe these sold for 20k BS. They never wanted to sell them that cheap and they certainly aren't that cheap now. It's anyone's guess if they will reset in December.
I'm pricing this toward the 20k BS side anyway, however.
It's a full potion, 10 pours (2 extra in case ya lock it) 150 paypal OBO, PM.