The Isabel line from Target fits the bill. I tried GAP and I found the crotch rise was always an awkward fit. The Target line also has a skinny bootcut, when most of the maternity jeans these days are skinny.

This may sound weird, but I was pleasantly surprised by my purchases from
Walmart.com. I got two pairs for under $20 each and had my mind set on returning them in the very likely situation they’d look and feel cheap and flimsy, but they are actually comfy and nice looking, so I kept them. Walmart.com has free delivery and returns, so that helped me make my mind, as well as the price.

Uniqlo