I got PP ones from a girlfriend for my first pregnancy but they were really high ones and later on in pregnancy they would just fall down anyway and be pretty uncomfy.

I have a Kmart pair too that I LOVE. They have elastic at the sides but not the whole way around. There are 2 kinds - some people like the elastic all the way around. Only around $30 and they look great! I cannot justify spending more than that on jeans that I won't wear for very long!