Most of the bounty managers have their website in which they upload the bounties in which they manage and make it easy for the hunters to find the bounties they manage and easy accessible for hunters. But these managers don't do upload spreadsheet for hunters to see their stakes.
I heard that there are bounty portals already floating around but I haven't join anyone yet so I'm not aware that they're not uploading any spreadsheet for hunters to see their current stakes. If that is the case then as bounty hunters, I would stay away from that because its not transparent.
The bounty managers on Bitcointalk always have their spreadsheet shown to hunters and make them awear of the qualified people and the rejected hunters , but to find the bounty of some favourite bounty managers is not that easy.
Why its not easy? All you have to do is follow the managers telegram so that you will get updated. Plus there are members who created a list of the current bounties like
tvplus006. So you can quickly scan current bounties and see what bounties you wanted to join.