I know what you mean, I went shopping for my first maternity clothes last weekend and they were either really expensive or really frumpy!
Maybe a bit late for you Tanstar, but what I've just done is taken my fave old lowrise skinny jeans into the alterations shop and got them to sew in a triangle of stretchy navy blue material into the seams at the waist (Im sure it can be done easily at home but I dont have a sewing machine). Now I still have nice fashionable jeans that are still comfy, and only cost me $20!
Luckily for me my babies not due til end of Dec so at least I'll get a bit of summer to show off my belly, im gonna wear short tops n paint flowers on it!