Have you checked out Ewa Michalak for pushups? My bras from them run around $50 taking into account shipping, but they come with removable push up pads and you could easily swap them out for your nicer silicone ones.

Madeira Darling is a snarky mystic, devout Satanist, serious Marxist, laughing dominatrix, and writer from San Fransisco where they live with their boyfriend in a house full of altars to their various demons. View all posts by Madeira Darling