Nursing bras for unusual size

I’m struggling to find reasonable priced nursing bras for my size.

34DDD prepregancy size.

I’ve bought a couple most don’t fit. I currently have one nursing bra it getting smaller every day. I was able to wear my regular bra with extenders but it starting to hurt.

I am unable to go to many stores to try on bras. So I need online suggestions. But none of the sizing makes sense to buy. According to the band size I need a small or medium. According to the cup size a large or extra large. My current nursing bra is a large from Walmart, but I bought a second one and I couldn’t even hook it. Same size look the same but I guess two different brands.

I don’t want to buy super expensive bras that don’t fit. Rather go cheaper.

Suggestions will be appreciated!