Maybe you would have more choice, and it would be cheaper, to buy a non-maternity bra in your size and then get the strap changed to enable it for breastfeeding.
I hate buying bras - its never, ever easy, whether buying maternity or normal.
Do you have existing size 8s in Hot Milk? Only ask because it is (at least I've found) a smaller size than other maternity brands and I have to go up a size. Brands exclusive had them in an internet sale recently and I went into a shop to try them on first to check my size because like you, I don't like buying clothing online and certainly not going to risk it with non-returnable underwear. Had told myself I would buy one in the store so I didn't feel bad about wasting their time, but then buy another two or three online. I paid $25 online and they wanted $80 in the shop so I checked my sizing and scooted on out of there otherwise empty handed. I seriously don't get the price justification for little bits of lace and satin.
Anyway, they've been on internet sale again since my first purchase so maybe they're a fairly regular sale item. Could be worth you looking out for.
The website boobytrapwareouse (dot com dot au) have a Hotmilk mat bra in 8C on sale for $25. (I actually have this style, albeit in a much larger size , and I really like it)
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