This article from Threads #174 (August/September 2014) by Norma Loehr will allow you to begin creating your own foam-cup bras.
Bloom's Endless Summer: My favourite use for Liberty fabric
Bra Bee '23 Sew Along - The Foam Cup Print Bra with Monica – Bra
foam cup LLADYBIRD
Custom bra pattern, Front fastening bra pattern, Margaret
Nude Push Up Bra Cup - A-Cup - Bra Cups - Bra Making Supplies
Non-Serged Molded Foam Sew-In Bra Cups 1 Pair/Pack
Ulla Bra Instructions
Custom Laminated Moldable Bra Foam Cups Padded for Women - China
Pre-Finished Foam Padding Cut and Sew Foam - Bra-makers Supply
Shapeez Tankee Short: Back-Smoothing Bra Ultra-Comfortable Cami
Orange Lingerie - Check out my bra making article in the August