Sounds like you need to request access to do a body corporate records search and go looking for your Manager’s agreement if they won’t give this to you, which should detail additional costs, on a likely per page production cost and might say who pays.
Typically these things are done on a cost recovery basis so need to be justified, and able to be challenged if considered excessive (by you at face value, or someone authoritive (sp?) should it go that far).
The $400 sounds dear but you don’t say how many units are in your building, and they aren’t saying who hasn’t provided email contact.
Another way for you to see all this is to request a Owner’s Roll data list which will likely come at a reasonable cost but likely much less than your $400 and would then allow you part or full list contact with other owners about your current issue or things that arise in time.