Wife went up 5 cup sizes, now she can't find a bra

We are less than a month away from the due date, and we're suppose to have at least 3 nursing bras. The problem is, she grew 5 cup sizes, and it's proven to be extremely difficult to find something that actually fits, is comfortable, and doesn't fall apart in a matter of days.

We've bought and returned at least a dozen different bras on Amazon, we can't even find a bra in a brick and mortar store with the right cup size, and I just want to help her.

She's not sure which size she even is at this point. BraSizeCalculator.com says she's a 34H, but her current bra is a 34H, it's tight around pretty much everything. The other issue is that her bump pushes up into the underwire causing even more discomfort.

Hopefully someone can point us in the right direction. She's been in tears the last few days, and I don't know how to help her.