I got both mine from Asda and they were £6 each – they are proper post op bras as well 
I was advised to get a DD and an E cup as they were unsure what size I would be. They’re super soft, unlike the sports bra’s so they shouldn’t cause any irratation on the scarring.
I’m booked in for my op on 4th June so fingers crossed they’re right.
Hope this helps Jodi, xxx