Winners is also a good choice Hammy. I find really good quality name brand bras there for $10-15 canadian all the time. I don't have the easiest time finding a proper fit either. Most stores around here have little selection if you are smaller than 32 in the band. It's worth looking tho, they just might have something nice in your size. They do seem to have more selection for bigger cup sizes than small. And even tho I am small, I need a bra that provides a lot of support and comfort. I usually pick ones with a racer back as I find them a lot more supportive and less pull on my shoulders.

They have a lot of well constructed bras made from good materials, not just your pretty and frilly but flimsy bras.