Where do you buy maternity pants??

I had 1 pair for the entirety my first pregnancy (8 years ago). A pair of size "small" maternity jeans from Target. I went to Target again looking for a pair and they're all sizes like jeans now?? I don't want to have to buy multiple! I'm a nurse and wear scrubs 5 days a week. I just want one pair of maternity jeans, preferably skinny cut. I am 18 weeks and still not showing but I can't button my darn pants! Where can I buy what I'm looking for?! I'm 5'5 thin build if that makes any difference.