i just bought a shock absorber bra from ebay £19
also my mum had a lonsdale sports bra for night after 2 weeks ( much more comfortable for night) which were £6 sports direct she also got some high impact sports bras from tescos that were comfortable.
I work in lingerie shop and always have people come in post op to be measured.. most the time theyre just in normal high impact bras, rarely the macom bra
hope this helps 🙂