I am not quite as small as you but I did pick up a pair of maternity pants yesterday from Target - size 10. They were on special and I got them for $30. They are SOOOOOOOOO comfy.

I know where you are coming from though with the sizes..... I had to literally search and this was the ONLY pair of pants in a size 10 (including other styles & jeans). Everything I could find was in a 14+

if all else fails try Ebay. I'm with you on not spending hundreds of dollars on clothes - I often wonder how they get away with it.